I like it, tbh. I've now put them all together (just dry-fitted, to get a feel for the size). They're very nicely done and drip with atmosphere, and should look great painted up. On the strength of these, I'll be ordering some more at the end of the month (got a nice colony world game bubbling in the back of my mind). They go together easily but some of the front wall tabs are a bit[i/] snug - easily fixed with a file though.
I would definately say they need to be built up permanently, I don't think they'd stand up to repeated assembly/dissasembly. Painting to hopefully start this weekend with notes and a work in progress, right here!