Hey nice to see that this veil of secrecy was lifted!
Ok so first up is to be absolutely clear that regardless of anything rule related created for this model and hashed out here the designer/sculptor/merchant will really not have any impact on sales nor will what we do here likely get used much in actual play with EA. The simple fact is that this thing is going to get purchased and painted and deployed as Thousand Sons Warp Palace in EA irrespective of the designer's head-cannon. This is especially true with the greater trends towards heroic and true scale representations of large centerpiece war engines in the EA scene. That doesn't mean that we cannot have fun with this and that there's nothing to be gained or enjoyed via this exercise
cool? Ok let's start.
First up is this set of rules posted above are clear that they were probably thought up from someone or someones that probably play 2nd Edition and/or NetEpic. That's not a knock or a ding on the attempt and those games; They are fantastic to play and collect for. However the core ethos of the EA game and 2nd/NetEpic are widely divergent in philosophy. I could write entire pages about this but in short, EA tries to lean towards streamlined rules and quick play using a series of common keywords as much as possible to evoke a theme and feel within the EA ruleset over the use of lots of low level details, tables, special rules, etc. As Atension pointed out, this thing has more special rules for the unit than most entire LISTS HAVE in EA. It doesn't mean those things are bad, just that they are not really fitting in with the rest of the game. I'll address individual items in detail with changes to a reasonable level that someone in a friendly game may actually play. As they are now, no EA player would probably touch these outside of simple curiosity for how OTT this appears.
Second we need to look at the base costs on this thing. You mention in the post above the Emperor class titans and some head-cannon for the unit and I think that's a good place to start with. So, the Emperor titans have a base cost of 1250 points and that's on a list specifically designed with the inbuilt weakness of low activations and high individual unit costs. It's hard to have a point design conversation outside of context of list but lets run with it regardless.
-The Crystal Palace starts with a base cost of 750 to the above mentioned Emperor's 1250. To put that in perspective, that's 75 points
LESS than a Warlord titan in most lists.
-The Emperor titans have a speed of 15cm, this thing has a 20cm boost.
-Both have equal armour or 4+ (which I think is fine for the big guys an pretty standard) and with Crystal Palace having a FF of 4+ which falls in between the two configurations of Emperor. I'm not going to bother with the CC discussion as it's too situational to the rest of the army built as to efficacy. This is why costing units outside of list is problematic.
-DC of 8 vs 12 to the Emperor (Warlords are at 8 as well so there's give)
-Void Shields of 2 vs 8 (again, Warlords at 6 so more good tone down from battle titans)
-Battle titans have
Walker, Fearless, Reinforced Armor, Thick Rear Armor to this
Fearless, Reinforced Armor, Thick Rear Armor, Transport(10), Skimmer, Invulnerable Save. Fair to say this is a bit
extreme, mate. Especially OTT when you add in that this thing can negate intervening terrain using pop ups which is the primary defense against huge war engines. EA stresses movement and concealment, combined arms and crossfires as core part of strategy and this all basically amounts to negating it.
Looking at weapons I'm going to note the closest titan class weapon to the palace here.
-The Twisting Gaze
--The closest existing weapon analog would be the Volcano cannon. The Gaze being 100cm vs 90cm. Also most units equipped with a Volcano also have limited fire arcs to the forward arc while the palace has this puppy firing all around. (As a note, the 360 arc actually fits the chaotic theme of the Tzeentch so it's actually good imho). The gaze is MW3+ to the Volcano MW2+, TK(D3). You've created a table and special rules for effects of this weapon which, again, Atension has already pointed out major EA breaking issues with. Honestly all those concrete effects of the table really are what happens "in real life" to the unit targeted and would in EA be elegantly modeled with the use of
Disrupt. It's fully addequate to represent all the warpy confusion and effects that the weapon would have.
-Interceptor batteries
--You've got 6x AA attacks at 4+ out to 50cm to an Imperator single AA4+ attack at 90cm. The Warmonger config is 4x AA5+ at 45cm.
--The Carapace Multilaser upgrade puts out 2+ AA5+ at 30cm and you can't take it twice
-Warp Flux
--Honestly there's nothing like this anywhere and frankly it's massively verbose and overwrought for EA and I'm not going to deconstruct it. It's also impossible to model the Warp Fire effect in EA as previously mentioned. The
First Strike ability with this weapon would probably suffice on this Assault Weapon. EA(4) is probably fine though would be super expensive as you need to understand that WE CC/FF attacks are one PER starting DC. That means this thing puts out 12 CC dice-I get the impression you perhaps might not know that about EA rules. if there's anything somewhat resembling this it's probably the lasburner but that's not even MW.
-Grief of Marra-whatever
--Cool name. I dig it
--3+D3BP at 50cm with
ignore cover. Ummm.. probably this thing is closes to being equipped with dual Apoc Missile Pods which would have a fixed 6BP though with
disrupt. I think the variability of the BP fits thematically to the whims of chaos and IC vs Disrupt is a functional wash to me.
So if I was to say take the closest titan to this, remove restrictions about where things an go, remove restrictions on the number of weapons, and not even take into consideration that some weapons/components are free as they eat up a weapon slot you'd get something resembling this as a starting point:
UBER-WARLORD 750
-Volcano Cannon 50
-Las Burner 0
-AML 25
-AML 25
-Corvus 0
-CML 50
-CML 50
-CML 50
Totaling 975 points. Even with the lower shields this is more than made up for with weapon ranges, Invulnerable, Save, and Skimmer abilities. Adding in the extra speed and that this thing basically shuts down the entire air game for most of the table through buckets of AA dice covering 7850ish cm
2 (roughly) on a table area of around 22kish cm
2cm this thing is
at best 1200-1500 points minimum depending on the list it is attached to (honestly spamming chosen and this would make for a completely bonkers BL force unfun in the extreme)
ok next post let's discuss how to put this into something workable in EA.
hugs? 
