Here is a Sci Fi building I started a couple of years back (there is another couple waiting to be finished). It will get used in both Wild Galaxy and my my Mega City setting.
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Its amazing what you can do with house hold junk. This is two food tubs and bits from the bits box.
Inspired by a pal on the Post Apoc Wargames forum (a miscreant called Inky), I made this hut...
I tried to keep it generic so it would fit into VSF/Steampunk to Sci Fi.
You need walls. This is for Sci Fi/MC1. This is a base and a bit of packing foam. Not to forget several coats of textured paint.