I've got a 1x6 screwed to a wooden saw horse, the legs are braced and it has several Jtec engine mounts screwed to it, though I use primarely a plate metal mount of unknown origin on one side. Instead of a radio system, I use a simple pushrod that is rubberbanded to the fuel tank which sits a little higher than carb level due to the 2x4 block that is screwed to the 1x6. All basic cabbaging really. I've used it for over 10 years and the only problems I've had with it come with engines bigger than a 60 which will start moving the sawhorse, till I put a cinder block on the bracing, then all is well again.

Anyways, it's nice to break in an engine and get familiar with it without having to put wear and tear on an airframe.