Hi Benny,
yeah, I suspect I got the dimensions wrong working from (very rough ) memory. Been a long, long while since I did anything beyond snorkeling.
Kokua, a good cheat on the 3000 PSI regulator is just to use a regular single hose diving regulator first stage, that gets it down to low enough that regular stuff can handle it. And if somebody has an accessory air outlet on their diving rig, say for their BC or whatever, then there you are.
doc…