For initial winter use, this thing will need some sort of heat source in order to keep the wife happy and the marriage intact.
Years ago I built a set of power amplifier test loads out of banks of 5w 10ohm resistors, 10 in parallel to get 1ohm with reasonable precision, and four sets of those in series to get 4 ohms. 40x5w = 200w max power handling, per set. Two sets per board. Two boards completed and usable.
Wiring could be series-parallel, parallel, or series.
Water blasted the exterior of this today, all lichen gone. As an experiment I put a bit of elbow grease into polishing about 1/4 of the roof on the left side to see if it helps prevent lichen growth.
It now holds a handful of tiny brake parts for its future axle, and three ~50l containers for future toilet experiments for future off-grid living and boat use.
Two weeks till the Mrs sleeps in it for the first time. Heating solution will be implemented before then :-D