I have the sold-separately 6'x4' box of cardboard buildings and they're quite nice. A proper hand could really turn them into something special with simple add-ons. Also the huge box I got has something like 20+ buildings and it was about $35 which is nice. I was going to use them for playtesting my 1/200 scale (roughly 10mm?) Macross/Robotech game but I've now changed scales with their kickstarter, shame.
It is nice stuff.