This consists of a relatively permanent panel on the left, and one on the right that's removable for some storage and access to the gas valves.
The semi-permanent one has the fuse box and gas detector. I will eventually add a storage shelf accessible from beneath the bed. With all the wiring going to the fuse box, I don't want to be moving this panel very often. About the only reason to remove it will be if I need service access to the water heater or its gas and plumbing connections. Since it's an on-demand heater, antifreeze and a good blow-out should be sufficient for winterizing. No tank to drain, or bypass valve needed.
The right hand panel covers space where I plan to add 2 drawers above the heater vent.
I may eventually make a door for those drawers, but at first, they will be hidden behind an easily removable panel. I can always cut the panel down to make the door, while maintaining the wood-grain pattern.
This panel also provides access to the front of the furnace. We will be putting a (GFI) outlet in the bathroom, and this point is right on the route. Since there was room to add an A.C. outlet, I did. So there. Maybe use it to plug in a vacuum.
Preparing the panel for cutout:
Test fit the panel and added the outlet:
And buttoned everything up (minus the trim work).
Since I don't have any urgent need to use the drawers, I'll build and install them later.
So now we're ready to dive into the john. Maybe I should rephrase that to say that the next step is completing the john (walls, counter sink, cabinetry, etc).