Ken, the dio bases (2) are a frame of 1x2's with 1/4" plywood on top. The pavement is black foamboard glued over the plywood. Sidewalk is the same 1/4" ply, painted with white house paint. The building fronts have foamboard walls (painted or with brick paper glued on) with a frame of 1/2" square plywood on each building. the ply frames extend 1 1/2" below the walls and attach to the base frame with wood screws. I can easily remove any building front for repairs or changes, or even swap it out for a new building if I want. The doors and windows on the tavern and pizza shop are from Colorado Model Structures. Most of the others are AutoCAD drawings printed on posterboard, cut out and glued to the walls. Wooden stick frames were added to give a 3D effect. The big display windows in the Family General Store are plastic from CD cases.Trees are G scale RR items set in brown tile grout. The orange traffic cones are those black plastic things the doctor looks in your ears with, cut down and glued to a styrene base and painted orange. The fire hydrant, streetlights/signs, and porta-potty are diorama items from eBay. Here are a few more pics.