I don't think the lack of detail is something related to lack of a 1:1 subject, lack of detail doesn't seem to be that much of an issue. It's the childlike features, and the poor fit. I had the old AMT Imperial Shuttle, I found it to be reasonably detailed with surprisngly good fit for what it was. I looked at the box sides of the new revell offering as I was considering it, but no way. The shuttle interior is WAY WAY WAY overscale, and looks like crap. The exterior detail seems to be softened as well. If i can find an AMT kit of something I want at a decent price on ebay I'll probably join the GB, but if not then I won't.
The nice thing about Star Wars is if you pay attention to the story you can take ALOT of artistic liberty with it. It's apprent alot of things were cobbled together for the rebels. Look at the Y-Wing. It was obvious it was supposed to be a sleek fighter, but had to be pressed into service before it was complete. Hence it's lack of body panels throughout most of it, yet the ultra sleek front end. Perhaps someone could scratchbuild the panels for it? I'm not much of a scratchbuilder so I'm not volunteering.
Star Trek is much the same way, there are enough tech manuals and such to make it open ended. Especially around the time of the Dominion War(I have the DS9 tech manual), and the federation did alot(story wise that is) of cobbling together from whatever they had on hand. Ancient hulls, showed up with newer warp nacelles, etc. It's reasonable to assume that at least in some respects, things were done like that in the Star Wars universe as well. Especially by lone wolfs who were rebel supporters, maybe somewhat similar to Han Solo. Maybe they built a hybrid ship of sorts.
We have a guy in the club who builds nothing but scratchbuilt sci-fi from everything he can get his hands on. I'll have to see if I can get some pictures from him and post them up.