hm.....i may do this myself. Pretty easy and quite cool. Did you sculpt the helmet or make it from something?
A gas mask canister is a must....everyone had one of those. They didn't look like the wwii canister; they looked like a big tin can with a long strap. The greatcoat eliminates the need to make a wwi style uniform. I've made a few custom wwi germans and doing the uniform was a pain.
I started an 1/18 scale A7V a few years back but never finished it. Here is a couple of shots of the roughed in hull next to a 1/35 scale built up example.
WW1 stuff is my passion. I have made a figure with a M-16 pattern helmet but I have no idea were it is at. Your custom WW1 stuff looks great.
Kirk Douglas : Mine hit the ground first
John Wayne : Mine was taller