I have never welded, but if a shop made these for me I'd think it's a pro job.
Which bed feet did you end up going with? Or is the machine gonna stand on these rollers instead?
Apropo garage, I gave it some thought for my situation, I decided I'd insulate the garage from the inside to do some climate control for my machine, doors included. I don't know how big your garage is, I'm talking standard german 3x5 garage. For winter: there's this company that makes heavy duty ceramic heaters. Not like the ones you see in baumarkts.
https://www.leister.com/en/Industria...1d&layout=card