I’ve seen a number of posts mentioning shops being shut down because of lack of heat.
If you are using power tools and lights all it takes is constructing an envelope that can be sealed in one way or another to allow you to insulate the walls.
You don’t need to do the whole space, the lights and equipment running will take care of the heat.
As to the LJ’s using only hand tools, I’ve done a little work with plane and needing heat was the least of my worries.
Just trying to help cure some cases of cabin fever.
-- When you are wrong admit it, when you are right forget it.