I have a little wood/charcoal burning stove that came out of a sailing  boat.
I think that it would fit in a Westy.
It is called a Shipmate and with a chimney out of the side it certainly
would keep you warm. The top has keepers to stop the pots & pans sliding off  when
the boat rolls or leans, unlike the gimballed gas stoves they have  now,

Sam W
87 Westy