I will leave it flat. There are 3 layers of insulation (sound and heat). I’m not worried about heat transfer and not planning heated floors.6061-T6 seems like a very capable alloy and temper for this application. That could have been a significant driver in cost. It is my understanding that Aluminum production is primarily domestic, so I am confused by the tariff reference.
Will the aluminum receive beading to mirror to the corrugations in the floor to increase the surface contact for heat transfer?
There is an Espar hydronic heater. A small computer fan/radiator is in the back hooked to a thermostat heating the cab at night.