What I would do for getting the exhaust through a wood wall is, take a non insulated stove pipe, then get a cap to close off one end, then take the cap and make a hole in it just big enough to fit the exhaust pipe through. Then cut a hole in the wall big enough to fit the pipe through. Kinda like this:
!Wall
!
-----------Stove pipe
Cap-->___!______________
------------------------------ <--- Exhaust Pipe
Cap--> !
-----------Stove pipe
!
!Wall
Ok, I suck at key-board drawings, just use your imagination 
Not bad art, I would call it ASCII-CAD sounds more professional that way. 
Thats pretty much what I did. Except I capped both ends one with vent holes, helps hold and center the pipe. Then the triple wall pipe is good for 2100F, overkill but other wise I probably wouldn't sleep much.
Yeah, I'd probably put 2 caps on as-well, I also might get some of that foil backed fiberglass insulation, which is quite thin, and put 1 wrap around the exhaust pipe where it is inside the stove pipe, but I wouldn't worry too much if you have a 2100*F insulated stove pipe, only for the non-insulated stove pipe.
