Hi All,
I found this interesting idea in my searching. Its probably not new a new concept but I have never seen it done so well!
Chris Nevard models 4mm finescale and used foamboard to construct his baseboards. The layout in this link is a 5' x 13" layout and must be extremly light!
I might try this for my 'next' layout (a small modular one) but thought i'd share it for those with limited space
Clicky
Clicky here too