After lugging my old board to a few conventions, I wanted something more lightweight, and with a few more details. So, a week back or so I started on a new one with Grimm and another friend. Here is the result after the first few layers of paint:

The layout is similar to the old board, except that now, there 3 modules 60x125cm each instead of 4 modules of 60x60 cm. I went without the altitude differences, mainly because metal minis tended to topple on the slopes. Also, the boards can be combined in more than one way now.
Basic construction was quite straightforward: insulation foam (the sandy yellow variety this time, not that the colour matters) covered with PVA, sand, and various organic scatter materials (mainly tobacco crumbs which I collected over the last couple of months). Concrete and street are 1 mm cork sheet. The cracks are simply torn in the material, the parts are then glued down with a slight gap between them.
A few service ducts are inserted into the concrete areas; they can be either used as cover, or as scenario objectives:


Roadside ditch duct beneath the access to road to one of the concrete areas:

And another shot with a bit of scenery:

Monday is my day off, so there are three days ahead of me which I can completely devote to finishing this board
