Yes it's been done but there are a few things you should know about the Jambo. As far as smokers go, it's kind of smoke and mirrors. Most people like them because of the fancy paint jobs you see on most of them. As a cooker goes, there are some flaws in there design that have bit many pitmasters in A$$.
lol, I have not cooked on one yet but have been around them a lot. they are fantastic pits but they are temperamental to say the least. like every open offset smoker they have a hot spot or 2 and a cold spot. most of them have a cold spot in the middle and are hot near the firebox and the exhaust. you can use this to your advantage if you cook small amounts of different meats during a cook and can use the temp zones to your advantage. I have heard of some cooks filling the cook chamber with water to try to get a handle on the irregularities.
I built a similar unit for my cook team. I insulated the fire box with 2" kaowool and once i get this unit hot it holds the heat very well. It is much more efficent than an uninsulated offset cooker. I also built a large charcoal basket which works well, but I need to add dividers to the basket to channel the burn flow. As others have stated, you can find hot/cold spots in this type of cooker.
Before you ask, the twin stack server no other purpose than looking bad ass, one would do just fine. I can control each one independently and most of the time only use one.
And on the eighth day God created barbecue …. because he DOES love us and he wants us to be happy.
Current smokers: Egor (trailered RF) and Easybake (tabletop pellet drive)