Lest anyone think there's been no progress at all lately, here are a few new pictures.
Here the fuel cell is in.
Here's the underside, with the fuel pump and filter. The main fuel line is installed, but it's clear that I need a 90 degree AN fitting to run to the fuel cell, so that will be a few more days before that's done.
Next I'll be putting the axles in and checking tire clearance prior to buying the wheels and tires for the back.