I wonder how easy it'd be to build a vertical model that burns charcoal. I'm envisioning a series of enclosed grates so that it burns more uniformly instead of settling and burning hotter at the bottom.
An old heating oil tank might work and because of its length it could probably handle 2 or 3 spits at the same time. Maybe if I ever convert my house to an LP furnace I could find out!
We had a post on this board a few years ago that featured a small, charcoal-fired vertical spit rig that was great for shawarma and doner. However, I've been searching a dozen different ways for the past half hour both on this board and on Google and I just can't find it. I know the price was in the $200-300 range, though.
All I'm finding is $700 propane rigs and commercial rigs over $1100. Quite frustrating indeed, as I really liked the grill that was posted here. (I think the post was by Don Marco).