Thanks again Don. Didn't realize you had an engine on it currently.
That last photo you showed of a metal stand is exactly what I was describing earlier on, like the pic I found of one for a Honda engine. But for the use with the engine and trans together (original post), I'd extend the length and maybe do the uprights a little different to support the tail end of the trans. Perhaps just support the forward end of the engine pan (like the lower left corner, but on both sides), then a center support that connects where the crossmember normally goes. Or similar. Nice job of illustrating, whoever made the pic. All the needed dimensions are there.