These are real easy to make. Mine will hold just an a-body k member bolted though the holes.
Then you can set the motor on by itself using the block rail hole.
The trans can also be removed or installed while on the cart. The tailshaft stand is adjustable as is the block rail stand. This stand has extra rails so it can be carried with a forklift.
Here are some pictures of it being used. It didn't take much time or material. It gets used alot. For stripping cars or putting them together. If any one is interested in pictures by itself let me know