How much are they going to be cooking on the smoker? How much room do they have in the kitchen? What are the building and health codes in the area? I would answer these questions and you will come up with just a few choices.
These guys are in MO. And they my be able to get a custom fit smoker for your friends.
Team: Pyle's BBQ; Yoder YS640; Good-One "Trail Boss" 60T; Weber Kettle w/rotisserie ring; Big A$$ Rotisserie; Weber OTS; New Braunfels offset smoker; Weber Smokey Mountain; Chargriller Akorn.
Saddles BBQ Bistro