I think a light weight top made out of lightweight plywood and either stiched or tacked together is the best bet, I made one for a M38a1 Jeep many years back, and thirty years later the same guy still has it. Weight was under 100 pounds, I'm sure for a Max2 the weight could be dropped to 50 pounds. Even if someone added the thin urethane insulation sheets, it wouldn't weigh much.
There are plenty of soft tops out there as well.