Roger,
Now THAT'S what I call ingenious!
I'm under mine all the time while the Jacks are in use and that's pretty cool. I've been a fabricator for decades and that is an easy project. About the only change I'd do or, suggest is, I'd make one side with a heavy duty hinge. That way, you undo bolts and, open the two halves and, it's off. Nice job.
Scott