I'm pretty sure I commented on these sets in the Action Figure Thread.  If not, they're amazing!  Love your progress pics, too.
I haven't seen a 1:6-scale Refit before.  This I'd like to lay my eyes on.  Six feet across is a BIG layout. 
I have a couple of projects I need to complete first, but as soon as I open my new 3d printers and get through the items I already have lined up, a 1:10-scale Refit Bridge (TWOK) is next on my list.  I'll need to check the dimensions to see if a 1:6-scale section would fit on my larger printer.  I have a feeling I'd need to break it down to the riser (raised floor), lower wall, and curved ceiling.  I'm pretty sure I could get it in one go for 1:10-scale.  I'm sure I could work out a 1:16-scale model, too (4.5" figures).