How about a wooden frame with a rubber/plastic liner and an electrically safe pump and heater cotrols
just get a truck bed, but a tarp in it, duct-tape the tarp into place
fill with water, and heat!
if you really want to make one, you'll need a large waterproofed frame, then put some sort of material, get one of those water heaters that you just plug in, and it heats a coil
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