Adding a stack on the OBS

[trink2030]

Recently got a Bradley, and with the help of the forum I swapped for a 900w element and added an Auber to it as well.  Smokes great, but is a real pain in the butt to pull in and out of the shed. 

My question is, could I add a 3' zero clearance pipe to the top so I can keep the smoker in the shed and pass 'most' of the smoke outside.  Not only would that eliminate me taking it in and out of the shed, but it would give it good dry shelter, keeping it out of direct sunlight and rain.  The shed is a bigger shed, 12' x 20' with a garage door and is well away from my house in case of fire.

What do you think?