I have an SL5 and it sags a bit in the rain.
There are several free-standing tents that can be pitched with just the fly and no body.
Or, how about a free-standing tent with a big vestibule and just put the stove in the vestibule? You'd only need one stove-jack in the fly and the body wouldn't need to be modded. The body/bath-tub should be a little warmer than just a thin fly when the stove goes out. Plus bug protection and waterproof floor.
I'd want a another door to exit in case there was a problem with the stove, or a knife handy
