All of these field stands look great.
I have a back yard stand.
No fences are allowed and no "unsightly" stuff allowed in the yard.
So....
One Wallmart Card table
One piece of plywood
Four pieces of 2 inch diameter pvc pipe that are about 10 inches long.
Caps for all 4 pieces.
Fasten plywood to table with 4 or 5 bolts.
Fasten "O" (or "EYE") bolts to plywood where landing gear of model will be when testing.
Drive pvc pipe into ground where table legs will be going.
Remove pipe and knock dirt out of it.
Put pipe back into ground.
Set table legs into pipes.
Purchase two 1/2 inch rods and put pipe insulation or swimming pool toy around it.
Drill 2 holes where horizontal stab leading edge will be on table.
Put rods thru holes and tap a couple inches deep into soil.
Fasten aircraft landing gear with bungies attached to "O" (or "EYE") bolts.
Place tools or radio on side of bench.
I use a white paint bucket for my seat when working on the engine and when starting it at idle.
After testing, remove table, put caps on pipes so that trash or dirt wont fill the pipes.
Fold table and place in garage.
Thus far I have tested only 45 size engines. The stand is as solid as a rock and the bungie cords do not stretch at all even at full throttle.