Thanks. The structures are Litko Industrial Terrain System pieces. Laser-cut plywood, notch/slot construction. Bought one of their bundle deals last Christmas and finally got around to building it.
It is rather spartan, but I default to playability over detail. My experience with painstakingly crafted details is that someone can snap them off in a second with nary a hint of remorse. I put resin scenics like the crates/oil drums, etc, on plexi glass bases, so they can be dropped in as desired to spice the battlefield up a bit.