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Hi Mark, I like carts with the 24" wheels for farm use. Any smaller than that and it makes moving them on soft ground a workout where the big wheels will roll great on soft ground. I take a piece of 1"x1"x1/8" angle iron and reinforce the verticle pipe then weld a 3/4" pipe horizontial about 2" lower than the acetylene cyl top. I "v" votch the 3/4" pipe then kick it about 15* then weld too the 1" angle iron. The pipe is about 2" past center line of each cylinder. I weld a 1/4" chain hook about 4" from the cyl top. I weld a pice of chain to hold the cylinders on the 1" angle iron. Cut the chain so it goes around the cylinders, weld in center of chain, and easy put on the chain hook. What the chain does is tighten around the cylinders by falling towards the bottom when the cart is moved sucking the cyl's tight against the cart bottom and 3/4" pipe so you don't fight loose cylinders when you move the cart. Too loosen chain just slide up the cyl's then remove from chain hook. For hose hanger I use a piece of No4 rebar (thats 1/2"). I bend a "U" so it's fits around the o2 cyl cap threads and make a curved piece to fit the cylinder with two "U's" spaced about 14" for hose wind up. This lets me easy and neatly remove my gauges, hose and torch when I want to leave the bottles outside. I never put on a "trash" box for storing tips and such. The tips get beat up and trash gets put in the box. T_Bone
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