Applied pressure, located, and drilled the hinge half to the front of the battery box. Removed the box and the hinge.
Deburred. Countersunk the rivet holes that will have the heads inside the box so as not to mar the battery.
Riveted the hinge half to the battery box. Deburred the firewall. Riveted the upper hinge half to the firewall.
Spent some time studying the plans to see what else I want to do at this point. Reviewed some of the recent fuel line hardware/connections I've acquired recently just to do a sanity check on what else I'll need.