Anti-tank nest 1/2

For my first post on this new blog, I wish to talk you about my anti-tank nest. As I'm planning to set up a 15mm FOW soviet fortified company, I have to build several 15mm fortications.
First of all, the anti-tank nest, I have been inspired by the excellent blog http://www.modeldads.co.uk/Life-at-the-Front/wordpress/?p=1524
I just made some few modification as I put a real gun inside, it's just some spare gun from Battlefront at gun and zis gun.