This post has been a long time coming. For now I have begun roasting in a somewhat crude drum roasting setup. I bought a coffee drum from the internet after much deliberation on whether or not I should make my own. It turns out the time invested and the cost of materials made more expensive to try to make and probably less effective (for a small drum, ~1lb capacity).
The drum I bought is a Behmor 1600 plus replacement drum for ~$30. Going in I had assumed I would have to do lots of modifications to.. just about everything. The initial setup was going to be done with a turbo convection oven, which I unfortunately bought, before I realized that I should just use my grill. Luckily the turbo oven is pretty sweet as a random kitchen appliance, so I'm still using it. In order to mount the drum, I ended up using some parts from an electric rotisserie attachment that didn't end up working out for the grill. After that all I needed to do was attach the drum to an electric drill and voila, a roasting setup!