I have a theory about thermal soak:
At launch, the rocket needs to be high pressure and low temperature. During reentry, the rocket only needs fuel to land - and thus you’re reentering the atmosphere and heating up your fuel tanks built to withstand high pressures. Since pressure is directly proportional to temperature, the now substantially reduced high pressure tank can withstand a drastic increase in temperature.
If you have a form of shiny steel that can withstand reentry without plastic deformation, you can then soak that heat into the interior of the rocket, and insulate the cabin. I’m curious about how thermal soak would be maintained. Some sort of refrigeration and insulation combo would probably work, like channeling heat from the cabin area steel with fluid to the top area of the rocket which can withstand equivalent temperatures to the bottom. That’s all I can picture at the moment.
I can’t wait to see what the design is. I hope it’s something that is easy to replicate so that other companies can put effort into their own launchers.