That looks very comfy, but I think I'd prefer electric heating (and I have no juice in the garage since some low-life helped themselves to the mains wires) as I'd be worried about CO or CO2 accumulation in an enclosed space...
Heating of some kind would be great.
Tea in a thermos flask for now, then!!
When the right to effective self-defence is denied, that right to self-defence which remains is essentially symbolic.
Freedom: Please enjoy responsibly.
Any idea that relies on murder for its survival in intrinsically weak.