This is an anti-tank bunker I put together using a spare Zis-2 barrel from the Plastic Soldier Zis-2 & -3 kits I posted on a while back (http://sedimentswargameblog.blogspot.co.uk/2016/05/20mm-ww2-russian-zis-2-and-3.html). You get spare barrels to complete each gun as a Zis -2 or -3, so in my case I had two spare Zis-2 barrels.
I built a rectangular box on an mdf base, using balsa sheet offcuts, and based the barrel on another piece of balsa. The earth banks were built up with blue high density polystyrene trimmed to shape and the wooden log revetting is made up of barbecue skewers. The rear door is balsa sheet with a barbecue skewer frame. I used some acrylic filler to smooth everything out. The ground surface is PVA glue mixed with earth paint and sprinkled with sand. Static grass and various colours of grass tufts were added to finish it off. The 20mm Russian soldier provides scale.
Quite pleased with this as, apart from a pack of skewers from the pound shop, the only cost was the price of the large base and a smaller mdf base for the roof.
I might add a concrete wall on a smaller base to screen the rear entrance from direct fire, just for completeness.
Thanks for looking.