Dave
I have actually seen ads, here on the Coast, for full workshops to be hired out over the weekend, complete with hoist etc, so you can go in & work on your car properly.
With your gear, I'd be worried about getting it back damaged (hard to do but not impossible if you're an idiot) & also the insurance implications - I did everything right but his jack collapsed, damaged my car & hurting me, so I want $1 million
Nice idea but could see it ending badly
PS Edz was a bit quicker off the mark than I was - something there about great minds!