Thanks a lot guys, I really appreciate your comments, especially given how quickly I put it together.
The little mechs were still on the sprue this morning. I'd planned to add some bushes & trees but they didn't look right, so knocked those together instead. They look quite green in the pictures but are actually German grey, highlighted with a few different shades in practice for the Stug GB.
Chris, just a flight of fancy or "what if" kind of thing, part of a series by Model Collect called Fist of War.