Metal Gear RAY... {
drools noisily a la Homer Simpson} Great work RaspingLeech, old thing.
And that Finnish Mozzie is a thing of beauty.
But anyhoo, I've taken on board a few suggestions and modified the Friar self-propelled gun I knocked out recently:
The Mark 3 is a post-War version with an added dozer blade to anchor the thing into the ground and absorb recoil. This being a British weapon, the wartime versions would have made do with either chocks under the tracks like the towed version, or chains and land anchors. Ammunition would be carried separately, with the gun crew crammed into the old Valentine hull. I'm thinking that the Mark 3 would also have a new engine, probably the Meteorite V8.