DPV leash configuration next? Seems like a good topic. I don't think I've seen a clear video explaining it anywhere. The most informative things I have seen have come from Halcyon and Seacraft manuals.
I use bungee cord at 6mm. It absorbs any movement. I put clear vinyl tubing over the hose clamp. Handle hose is unnecessary. I use a choker made from bungee for streamlining the rig. For bands… you guessed it, bungee. 155cm for the cord isn’t universal. Each tank has a different length, so adjust it accordingly. When burning ends, have a bowl of water handy and dip your fingers and fashion the burnt/ melted ends. No need to mess up a lighter.
Aren’t you supposed to install the big bolt snap on the opposite side you are showing? (The big bolt snap on the bottom to be clipped on the hip D-ring)