just the size of the Battlestar classic ... the "not so great model" of a battlestar. - or in other words - a medium sized - but rather light battleship. - the battlestars ... in disco lore ... are no "full" battleships, but the closest thing to civilian battleships.
so i think a not so fearful look - and a size that is less efficient than a real military vessel is in order.
and - no - before i have actually textured it - it makes little sense to really compare it to other ships. but it would be much bigger than a lib dreadnought for sure - ... um.. almost every battleship is bigger than a lib DN anyway.