28mm Sci fi Wall Gunslit

Ever look at a cardboard box and think "gee, that'd make a great piece of terrain for my popular 28mm sci fi war-game! If only I could decorate it a bit to make it look less like a cardboard box"? I had the same thought a few days ago, and wanted to embed pillbox-style gun slits onto a terrain piece I'm making. This little piece should do the trick. I hope you enjoy!

-Leo