Himcules - I also installed the Gen II myself. You nicely listed the uninstall and install procedure. I however would suggest to self installers to make the final plumbing connections with the heater partially hanging out and prior to the final screwing down and caulking. This makes life more easy.
Also as I reported in my post ................
Love my Girard Gen III Water Heater
that my gas line was soft copper tubing which required a 90 bend. I mentioned not to make that bend without a tubing bender; otherwise the tubing will kink in a flash if a bender was not used. I had and still have a problem with the control pad. The back supposedly can be pried off so that it can be screwed to a wall. With concern of breaking the control, I simply Velcro'ed it.
So what are you doing about painting the door?