I'm just now getting caught up with your progress. Great news about the oven. I'm glad you didn't have to get a thermostat.
So now there should be only 2 pilot conditions. 1. Idle or off (thermostat off, or thermostat satisfied) 2. Extended to heat safety valve sensor (Calling for heat, or broil) Correct?...

So, that's a pretty nice blade switch to have laying around. I have a ton of parts like that, but they are not from this century. Still, good stuff to have when you need it. So that transfer switch cuts out the solar when on shore power? Did the relay actually fail or just noisy?
Diggin' the hose holder, looks good. The tray is what makes it so handy. You can do a much better job of keeping the outside well rinsed. I'm doin that for sure, but I think I try to find 5" post cover 'cause of the fittings on hose.
Gotta run. I'll check ya later.
McDave