RE: *Cheap Made Engine Test Stand*
Here is the best pic I have of one I made from scrap lumber and Rustoleum red paint. The design key is that its base should extend as far in front of the prop as is practical. This cannot be seen in the picture, but the front base extends about 16" past the vertical portion. This will prevent tip-overs, and minimize foreign object damage. The side supports have a cross brace across their base to the rear provide a location to stack bricks to weigh it down. Don't forget to make it tall enough for ever growing propellers! I have seen an engine pull this one along on the ground with a 16" concrete block on the rear deck. It took about an hour to make, using deck screws and construction adhesive. Good luck.
Roger