[quote=mattmanganon]
We've already discussed this, it's not Heresy Era, I've said this a number of Times. Also, as you said before, size, in the Warhammer Universe is debatable, as things are constantly being changed. Lexicanum (My go to source for Warhammer knowledge) said that (the same cannons mounted on a ) If so, then a Thunderhawk would have to be pretty fucking huge to carry a generator capable of powering it up a weapon of that magnitude, without losing it's flight capability.And as for the ship... Well, after looking into it, apparently things have got pretty fucked up as far as size goes, apparently, now, the smallest Capital ship that the Imperium fields is the Cobra-class Escort Frigate at 1.5KM. unfortunately, that thing has little to no space for an assault force, built like Defiant from DS9. Plus, of course, dat look... Vengeance is an awesome shape for a ship.Fuck it, Let's say that the Vengeance is 2.5KM and have done with it, Who's gonna complain? Matt Ward? He can blow me.
[/quote]

I'm just going to leave this here. Would it not be better to take a ship from a franchise with more reliable and consistent sources?

I mean surely there is another franchise out there you like as much, even if you were to go ST like Assallya IIRC she is planning to come from a ST galaxy where the Kin or Kiith w/e are in charge. You could come from one without them.
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[img]http://fc07.deviantart.net/fs70/f/2013/281/c/7/size_comparison___science_fiction_spaceships_by_dirkloechel-d6lfgdf.jpg[/img][/hider]
Halo(this one gives you good ground troops and there is more information on the Franchise)
Freespace
Stargate
startrek
BSG
eVe
Firefly
Maccross
Star Defender
Wing Commnader
Babylon 5
X(1-2 or 3)
Evochron
Star Craft
Hitchhickers Guide to the Galaxy
Farscape
Deadspace
Aliens.

Plenty of them there.