I have made the fold flat system a little simpler. Actually this is the design I have made some time ago for connecting ground tiles ... and I just remembered it again :-)
So with that I have built a house using the fold flat system. Above you see the parts disassembled and below put together!

If you want you can take the upper clamp off to better have access to the interior, but it will help keep the form of the wall and also to position the roof.
Speaking of which ... now I have to tackle the fold flat for the roof!