I'm working on a 55-gallon drum smoker right now. Here's my thread: https://www.indianagunowners.com/forums/break-room/300269-ugly-drum-smoker.html
I finally acquired a steel drum, so I'll be updating that thread soon with my progress.
There are lots of ways to build them. Head over to bbq-brethren.com for a ton more information.
As for features...you basically need indirect heat, directional air flow for smoke circulation, and a way to control the temperature. The drum provides this with adjustable air intakes on the bottom and an open exhaust on the top.
From what I've read, they are just as efficient as the vertical smokers made by Weber. Quite a bit more efficient than horizontal smokers. Some people wrap the exterior of the barrel in insulation for even more efficiency.
And pretty easy to build. Although...if you're not allowed to grill, how are they going to feel about a home-made smoker??
You handy with welding? There's tons of options if you are. A lot of people make pretty cool ones with gigantic propane tanks or air compressor tanks, with a horizontal offset like you're talking about.
There's tons of ways to do it. Shoot, I've watched Alton Brown build one out of a wood box and an electric stove burner. Or a flower pot. It's pretty fun stuff.
You guys suck! Me and my apartment living won't allow me to own my own grill.
Having said that though, I'm considering making me a smoker...I had a design in mind, but what features makes a smoker a great smoker?
Maybe something like this?
OR:
Maybe something like this?
OR:
apfroggy0408, feel like sharing a recipe for that chicken? Is that breast meat?
I have a hard time keeping chicken breast moist and tender.