Looking at that running gear, it looks M2, but the Hull looks wrong.
I'm afraid, you maybe right. The keel has only been supported at two points, wheres it should have supported the whole length.It's in a perilous state already - look at the hull droop forward of the cabin.
There is a reason for nearly all the Locusts have dummy turrets, they were designed to be easily removed for transportation. Turret off placed inside the fuselage of a C54 and the hull carried underneath.Wow, with your eyes shut that turret looks spot on! None original engine as well. I've seen repro tank turrets cast out of concrete that are hard to tell from the original externally. That might be the way to go, or, hate to say it, fibreglass. The originals are like hens teeth.