Richard Wood wrote: spray foam kit, insulate down just below grade. this will seal your walls and insulate. if you want it pretty, board lath ? and dry wall.
skip the insulation on floor, let the heat climb into floor and warm your feet upstairs.
Never did the large heat sink. No room between equipment I have 80inch lathe , Cnc mill in basement, plenty to heat up.
2 garage (un insulated doors) Plenty of heat loss in mine. I ditched wood stove (tried 2cd burn with this unit) and went to Rocket/Gasser. Little dangerous to run, but cut my wood consumption in half last year.