Rainbows in the Lehigh Valley Gorge

[TMo]

Yes, the layers add "depth" which is desirable in modeling 3D buildings.  Unfortunately, adding that depth increases the number of prints you have to make and means the expenditure of much more time.  The kits from Clever (photo of two of their pages below) tend to be walls and additional layers on the same sheet (the metal roof and the add-on layers for the center ridge cap and individual seams are good examples), but those aren't FREE....