This is the finished re-purposing of a hospital medical cart that I bought surplus for $30. Material costs were kept to a minimum by using bed frame angle iron and 1 x 4' length of 1 1/4" box section for the bottle holder. Total material cost $20.
The position of the extending knuckle dictated that the bottle be in front of the cart for C of G purposes. The vertical adjustment allows precise set up and control from the front of the machine.
Rod storage was by reaming out a 3/4" conduit joint and clipping these to the cart with conduit clips so i can still see the rod specs. The maneuverability of this is awesome.