I have made good progress. The seam sealer has set up and finally mounted the E-brake. I ended up going with a hydraulic brake for easier swap to discs in the future.
All the old metal then got a good coating of implement paint flat black. Everything instantly looked better.
Finally underneath all but the tunnel was coated. It was quite the feeling to see the underside look this nice after 3+ years of rust repair. This has been a journey I thought would never end.