You may be able to get a moto camper trailer and modify the side car rigging to use it.
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you dont need the full sidecar (the tub) just the under parts. From long drivers of hacks they find reinforcing the rigging a must and as you may be cutting and welding the frame up do the reinforcing then.
At one time before the silly big RV craze there where pop up trailers or tent trailers, many people had one. I got one cheap and rebuilt it. There is nothing to them. A steal frame supporting a plywood floor a wood side frame bolted to the floor clad in vary thin aluminum. A poly canvas tent that folds in and attached by snaps to the sides and the roof. The roof is a sheet plywood with vary short sides clad in the same thin aluminum. The roof and side are sealed with a rubber seal in the roof. The door is hinged along its length and has 2 parts that slip together the door frame is part of the sides framing and roof with the 2 other parts on the tent that slide in to the side framing and roof frame and snap to the tent.
For a side car you can go with a side slide outs and or a frunt or rear slide outs to keep it rig small but add inside space. Suport the slide outs with aluminum rods(socket them in the frame and slide out). As for the the stove I cant see using it inside the rig with out making the tent much bigger one flame up and you will be lucky to cut your way out in time.
Now for the out side building boxes in side the rig under the bed is the way to go. A locking water tight door in to 1 or 2 of the boxes and a good slide out shelf like in kichens and you have an out side cooking area a nylon tarp atached to the roof sum suport poles and your dry and in the shade (more or less)
Screens and thick clear vinyl zippered to the tent for windows some poly for a shade.
Some things you can do better than this is fiber glass over thin plywood sides roof and reinforced floor you can cut the woods bulk down a bit and using nylon tenting, drop the door and go with a zippered tent flap for the bead Id go with a good thin gelfoam.