Mike, so you realize that Nu-way is a Michigan company ?
http://www.nuwaystove.com/Perhaps you could work together on a smaller capacity stove. It would need a pilot, a circular burner good for say 1500 btu max, inside a cylindrical tube of about 3" diameter with a 4" heat shield that blocks the radiation over a bit more than 200 degrees of the circumference (opening opposite the corner) then an expanded metal type shield on the front to prevent direct contact burns. The whole thing needs to go in the corner of the pod as low as feasible (heat rises) and 1" will be more than sufficient for the chimney. The "cozy cabin" heater I have in my blind uses a 1" tube for the chimney and it is good for at least 6000 btu.
Even just the pilot by itself will prevent anything inside from freezing, but thats hardly a comfortable temperature for sleeping.
Right now an ordinary person can't get access to the needed valve/interlocks needed to shut off the gas if for some reason the flame blows out, but Nuway has access to all of that stuff given the line of product they produce. The kind of burner used in a propane camping stove is all that is needed. Some of these stoves sell for less than $20 so that has to be a really cheap part, its just the "extras" that you or I generally can't buy ourselves.
The cylindrical can will heat by radiation as well as convection and it will be dry vented heat, the best kind. To allow water to be heated in such a confined space is a big question, (boiling water can produce a prety bad burn) but if needed that requires a surface of at least 5-6" in diameter so a lot bigger scale. The only container I can fit on my Cosy Cabin heater is a military canteen (the type that goes over the water bottle) and thats after I cut off the "rail" that was fitted to it. Not even a tin cup fitted...