A bunker is a bunker

I wanted a bunker for my 10mm soldiers from Eastern Front, and wanted one in which you can put the soldiers inside. I thought about making a removable roof but seemed too complicated, and then remembered those bunkers White Dwarf made for Epic, using a cavalry base for the roof and leaving the back opened.
My infantry bases are 3X3 cm. and artillery pieces like ATs are 4X3 cm, so I needed a bunker of 4X4 cm. that could contain either, so I took a 40X40 mm. base and some plasticard I had lying around, and made this bunker.
Maybe is not historically accurate but it works!

Below you can see a Pak 40 entering inside.

Pak's view from outside.

HMG inside and officer standing next for scale.