Thinking about this and looking at the model and the related range (especially the Plasma Blastgun on the mkI, which is only about half the width of those on the mkII), here are some thoughts.
As to main armament:
I think that the mkI Stormblade should carry a Plasma Destroyer like the Leman Russ Executioner variant, (and co-axial one-shot missile) and leave the mkII as-equipped. That said, the gun on the mkII appears larger than that of the mkI Warhound Plasma Blastgun, so perhaps some alteration to the mkII is in order.
Alternately, we could consider the mkI to carry a Plasma Blastgun, along with the co-axial missile, and that the mkII should carry a Plasma Cannon (3xMW, +15CM range). The entry should be "Plasma Blastgun and Hellstrike Missile OR Plasma Cannon". In both cases, there should be a cost increase. The Plasma Cannon is a 25 point upcharge on the proposed AMTL lists (over the tier one Battle Titan weapons; the Plasma Blastgun is in a tier below those as a Scout Titan weapon, and should probably be considered cheaper still). Perhaps the upcharge on the unit (with either configuration) should be something like 25 points (since this is a "tier 2" battle titan weapon, and the AMTL lists seem to value scout titan and tier 1 battle titan weapons equally)?
Of these two options, I think I prefer seeing the mkI with a Plasma Destroyer because a) it gives it longer range vs. the Plasma Blastgun, which makes sense given that the mkI has a long, slender barrel, and b) because it leaves the mkII alone (which I think comes from Imperial Armor), and requires few changes across the list.
Onto the missiles: I'd also propose we keep from creating new rules (at least, new to this edition of Epic) for weapons, and instead go with some others that are already in the Imperial arsenal. Likewise, I think these weapons should be vehicle-grade, not titan grade. It probably doesn't make sense for a superheavy tank to carry a comparable weapons load out to a scout titan (i.e. more than one titan-grade weapon). It should, instead, carry either about one titan slot's worth, plus 1 tank's worth of capability, or 2-4 tanks/transports worth of capability; look to the Shadowsword and Stormlord as precedent in the former case, and the Baneblade and Stormsword in the latter case.
On the co-axial missile (known as the Hellion in Epic 0-2ed), we could say it is a Hellstrike, like what is carried by the Vulture, and use those rules (i.e. eliminating the TK aspect). This helps avoid creating additional/special rules and instead just alters the loadout slightly, plus, it also gives us some cost-basis for it in already play-tested rules. Otherwise, we end up with a tank that's carrying a mini-Deathstrike, which seems unlikely to be balanced without a significant cost jump.
As for the Hellfire rack, let's re-consider it a Hunter-Killer rack. That said, multi-shot Hunter-killers are categorically better than a lascannon (range, firepower, etc), so there should be a cost bump, there. Compare, for instance, the Space Marine Hunter and the Predator Annihilator. They are the same cost, but the PA is carrying 4 total lascannons (two combined in the turret for AT4+, the others in sponsons at AT5+), while the Hunter carries unlimited-shot Hunter-Killers (AT4+/AA4+). Following the cost-basis for those tanks, I think this should be a 20 point upgrade.
As for the battle cannon, the barrel is simply way too short, and it ought to be instead stat'd as a Demolisher or "Snub (Nosed) Battle Cannon". In either case, this is vastly superior to a lascannon and should cost more, as well.
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