These are simple enough to build
Just make them tall enough to clear any oil pan, then they can be used on any future engine
You could always start with engine mounting plates (like we use in off road sand rail builds), then build off them
example:
https://www.tabzone.com/12106-01B-LS...LATE_p_71.html
I prefer the casters than screw in from bottom, so easily removed, to be more secure during transport, say in back of truck, etc