Cheapest and best roofed structure

[john the architect]

The structures are two story 7' x7' steel framed towers 20' high with hipped copper roofs.
I have designed different buildings that can be made from them as the basic structural and architectural nucleus. they are recycled commercial structures that probably cost $20k each originally and I recycled them. Again, I am not building anything, but designing what can be done with these. They can be easily made into secure outpost campsites as well if someone needed to get a foothold before going ahead with the full-on building process.