Go to my CarDomain site in my sig below and have a look at the one I built. If you need more photos or measurements just PM me and I'll try and get you everything you need. I spent almost a full winter crusing the web and looking at different types of rotisseries before I built this one, and it works just super. Hope this helps.
I saw someone made one by joining two 1250 lb engine hosts with some square tube welded to them. That would be a quick way to do it. most of the hard fabrication is done. The only issue might be height if you dont get the right engine stands and have a wide body.