Has anyone seen or made insulation out of plywood and foam (or some other kind of material)? I was thinking of making something that i could rest on and pin to the roll cage under the soft top to act as both insulation and support so the soft top isn't weighed down by snow.
I'd be more inclined to use only sheet insulation (1/2"?) supported by PVC pipe bows. You can heat the ends of the PVC to flatten them, giving you a fastening point or ability to shape a tab to slot into the cage somewhere(s). Ziptie the insulation to your bow(s). Desired end result, whole lightweight assembly pops on/off as one unit with no tools.
I used to put a PVC pipe under my bikini to keep rain from pooling. Since, I started parking on a berm and parked the PVC in the garage. Insulation isn't needed for my wraparound windjammer, duster and bikini...I lose more heat to air gaps.
But, to your point about snow...can't say. I just keep parking on a berm, no bows. I put a cabcover on if I know the snow is coming...no need to have it freezing in place only to de-thaw and possibly drip all inside. If I'm driving, I don't worry about it. If it starts to pile up, I'll just drive faster.