Don’t know if this helps, but here’s my solution in my garage/shop.
Mounted it off a beam in between the bays, but could easily be made to mount on a wall. Just squared, levelled and plumbed the base, then used some regular door hinges to allow the gantry to swivel at the wall mount and at the head.
This was meant to be a temporary solution until I could replace most of the flex tubing with hard pipe, but you know how that goes. 
Cheers,
Ed T.