Anybody ever try this?

We're remodeling the top floor and two bathrooms of our house. Our master
bedroom is smaller than some, but we like the privacy and the view from up
there so we put up with a smaller area. We eliminated a heating duct that was
in the *middle* of the floor when we had the hardwoods refinished a couple of
weeks ago. Now there's no heat in the room, and we are looking for a good
solution.

We'll be running nat gas up to that floor so the Mrs can put in a washer/dryer
near the bedroom and master bath and avoid lugging lanudry up and down the
stairs.
I think that would be an opportunity to put in a small, thermostatically
controlled fireplace. The household Nat Gas fireplaces I've seen take up more
floor space than I'd prefer. Two of the bedroom walls are outside walls and the
others have finished interior spaces beyond, so recessing a fireplace into the
wall won't work. A boat fireplace would be perfect- compact, attractive, and
more than sufficient to heat the area. Only problem: we don't have an oil
furnace so there isn't any diesel on the property and it wouldn't be practical
to set up an entire storage and delivery system to run one small fireplace.

Anybody ever convert a diesel marine fireplace to Nat Gas? That would be the
"perfect" solution. Is it possible? What would be involved?