Reconfigured my lithium pack to make it shorter, and swapped out two of the individual packs for healthier one, so I can get the full 21+ amp-hours out of it.
Rebuilt the battery tray to be 3" longer and 2" wider, out of old 1/4" ABS(?). Took longer than expected.
Now it will hold either chemistry of battery
belowthe under-seat storage.
I will make a false bottom for the under-seat storage out of a new piece of 1/4" ABS I have laying around. And I will re-route the breaker, if it will fit underneath.
That's the big stuff out of the way.