Casey, as you work on your design ideas, try to work in an evaluation of cost of construction weighted on a return of utility. The challenges of producing the concrete wall plus all the work-a-rounds of siding, insulation, wiring, fenestration and so on. A concrete wall is fixed structure, be mindful that a concrete wall is not easy to adapt to new needs, envision cutting out for openings and the placement of lintels also the design of a wall complete with rebar is very specific and maybe it should not be renovated without accounting for integrated reinforcement.

If I were presented with such a building plan, I would argue against it and seek other means to enclose the frame.

As to heating, I would look for solutions that have a repairable method of heat distribution, so no tubing in a concrete floor. There are under floor sheathing methods. Not my field.