Following this thread because I've been interesting in finding or designing a stand. This became a "thing" over the last year as I helped a friend tear down 3 D675 motors.
I generally like the idea of something that is adjustable so it can be used on multiple motors.
I've seen that rotisserie-style before but it looks a bit too hokey to me.
My friend and I were thinking about designs which would bolt up to an automotive engine stands to leverage the rotating function. I was also thinking of designing it in a way that it could still function as a regular bench stand..it would just have the provision of bolting to the standard engine mount plate.
The one MGFChapin posted is in the direction I was thinking; I like the fact that the design could accommodate rear mounts with different fore/aft locations. But height and width are also something I'd want to address. For the first: I think using a joint on the frame-side attachment
(instead of the threaded rod straight thru the box tube) would allow for a range of rear engine mount heights. Similarly, a heim joint on both ends would give a bit of width adjustment. I feel the adjustable support arms width is important because they should attach as close to the motor as possible.