KrankysFirebrand48 About the critisim, Th ARC-170 is pretty hard to make size-wise. I wanted it to be smaller, but it would then have no rear-gunner. Also, most sites said it had a droid, so the rear gunner's cockpit would be a bit farther back if it wasn't there. About the corvette, I do think it does need some rework. About the venator, I think it would be to late to scale it down, as the acclamator has been scaled with it, as well as the lucerhulk.
About the Nebula, I don't know about it, so you will have to post a photo or somethin. If you mean Nebulon-B, then no. Ships that are super thin but long I'm not good with building.