Finished my battery box for the Honda. Unfortunately, I realized when I went to install it that, while I measured it to fit the space available, I didn’t consider getting it INTO position, or how difficult it would be to get bolts inserted (from beneath) and tightened. Once I got it in the frame, I was able to mount it OR bolt up up the rear fender, but not both. Also, the fuel valve turns a quarter-turn clockwise from this position to shut off—aaaand there’s a frame tube in the way directly above it. It will have to rotate 90 degrees, at which point the fuel inlet will be pointed down, not forward. Oops.
It’s going to take a bit more head scratching, and probably more cutting, but at least it went together correctly.