Well I've seen a test rig built from the lower half of a buggered CB750 frame, basically the builder chopped off the top rails, steering head and downtubes for ease of installing and removing the engine, but left the electrics, oil tank etc in place, and after chopping off the back of the bike installed a fuel tank, a bar with a throttle and a pair of coils, then just welded on some legs with castors so he could move it around the garage. Seemed to work fine, but I'd hate to chop up a good frame.
I do like that CycleX stand, having access to the whole engine while it's running would be pretty useful, I'd think? Cheers, Terry.