There was a discussion on another forum I belong to (not a wood burning forum) about putting a little stove in a guys camper. There's a guy who wants to do it, and there's another member providing info using his set up as an example. I poached a few pics to show you guys. Thoughts on the wall shielding and hearth pad please...
I put a small Ashley stove in one years back. Used firebricks under it on the floor and made a metal heat shield to go behind it and on the sides. Not the best solution but it worked safely for years till I eventually sold it.
Look at marine stoves. They put those things in boats all the time. Amazing the small spaces they put them in. Maybe some ideas for you. Chief