Mephiston: That is a pertinent question... the answer is very probably none. That said, I've played a good number of games with verious combinations of the models I have over the last year or two, so mixing and matching a bit would probably result in something I've tried out before.
The_Real_Chris: I guess I'll just have to hope the dice gods admire my bravery then...
The Zzap-fortresses are really there as a "Ooh, that sounds cool" decision. In tactical terms, they're more a bonus than tactically decisive; they've been most successful when doubling to within 15 of a big enemy formation, shooting - OK, doubling and shooting isn't great but, notwithstanding the 4+ TK shots, I get 50 shots in total from this formation - and then providing support for an air assault. In that context the Zzaps are far from optimally used, but they are there if they're needed, and make the formation more of a threat (even if it puts many eggs in 4 very proximate baskets).
It does take a bit to kill the Fortresses, but in my experience it's very risky to stay mounted up. Anything with TK shots will decimate them, and even basic AT fire is dangerous when the critical result is so nasty. Good point on clarifying that in the warm up too, thanks!
Man of kent: I had checked through the updated codex but it didn't even enter my head that I might not be allowed Zzapfortresses anymore. Fortunately that option's still there. I did think of a Shield mekboy for the Battlefortress, which may yet be a good way to spend a few spare points if I need to rearrange a little to fit in more Flak.
fredmans: Cheers, and good point on the flak-big gun equivalency (though, while more dice is Orky I'd say bigger gunz is also Orky.
).
Tiny-Tim: I think you're right that the 950 pt formation is a bit OTT for 3000 points. I got a bit carried away when building and painting them I guess.
Good point from everyone on the Flak, or rather, the... F-lack of it, badum-tsssch. Quite careless really. I have a few Flakwagons in various stages of completion that could be thrown into the mix.
First there's an unpainted one which will be done in Evil Sunz colours. That could go with the Blitz Brigade (replacing a gunwagon) or be added to the Kult of Speed. Option one requires no other list changes (good), but concentrates the AA cover (bad); option 2 allows me to spread the AA cover (good) out but would slow the KoS formation down somewhat (bad) and needs list changes (bad)
There is also a Deathskull Flakwagon which I could add to the the Deathskull Warband (the one that currently has a Battlefortress). If I dropped the Fortress and added a Flakwagon, that would leave 80 points to spare, and would mean the Warband could garrisson, though it would obviously curtail their mobility.
Finally I could probably kitbash together another Flakwagon, which could obviously be from any Klan. I'm leaning towards putting one with the Stompamob, replacing a Dread if necessary, though I'm open to suggestions there.
Cheers to all of for your help.