Hole in roof?
This is really a fun project. Many ways to go- and, of course, your way is the best!
As to the stove, that little monster will likely heat you out of the van in all but the coldest weather. I would be inclined to try it out the back door first. Perhaps, remove a window, insert sheetmetal replacement, add stovepipe els, and have at it. If the back seems like the place for it, you might even open the door, place it on a little enclosed ledge and run the flue straight up.
Blank, sorta, slate.
Have fun.
Dale