Ended up bringing my 30 cft pony home today. I was going to rig it out myself from the hardware store, but I got a good deal on a stage kit ....
You will probably end up using a bit of both the stage kit and the hardware store.
I don't think that I've seen two ponies rigged alike. Keep looking at what is out there. I'll run through what I did, you may find something in it that you want to try. Mine is a composite of ideas borrowed from many other setups I've seen.
The hoses are secured by a rather thick bungee on top and a (motorcycle?) innertube on the bottom. Leave a tail on the bungee so you can grab it for a quick re-stow. Don't put knots or plastic beads on the bungee tails as they catch in every "V" you pass by. Horrible on a broken down scattered wreck. Reflective house numbers are great for marking the tank with contents and your name/initials.
The band clamp is inside of a slit piece of clear vinyl tubing (hardware store). It is there to keep the tightening mechanism from nicking my tank. I like brass and glass too. Flip it outward if you want to be able to read it during your dive. I keep my turned inward to reduce visual clutter. I tend to read gauges that I see, you will only read that one on the surface and (here's to hoping)
never U/W. Keep the loop of hose for the secondary reg clear. If I tucked the secondary in from the other side then the SPG would be in the middle of the loop and you wouldn't get the full length on deployment.
Back to the first picture. Don't use adjustable wrenches on your gear! The loose jaw puts all the stress on the ridges and will surely round them over time. Use the proper fixed wrench. The cheapest set of fixed wrenches will easily beat the best adjustable wrench.
And lastly, Congratulations! Welcome to the world of "it never ends". Now you need a transfer whip and endless threads on how not to blow yourself up.
Enjoy!