I've got a two-eared radiant propane heater for when the cold wave comes. Also a "yellow flame" can heater. My problem (if you can call it that): the garage is about 1200 square feet. Pretty well-insulated, with some drafts along the floor. I can run the propane all day and it's fine, oxygen levels-wise. But the heat doesn't get all that hot, and the ambient H20 level also climbs pretty high, so it's no good if I need to paint anything—messes with even rattle-can primer.
This could work out though, since the next phase of work should not involve much (or any) paint and little or no (I hope) fiberglass and adhesives work: Mostly rivets, screws, wiring looms, grommets, nuts, bolts, etc.
The plan right now is to get major assembly done by late February, if possible, then take it apart and paint in March or early April, and then re-assemble by early May.
Here's hoping I surprise myself.