A bunch of little things have been done up to this point. I am targeting priming floor & firewall, undercoating floor, and painting the firewall Labor Day weekend, otherwise it may have to wait until next summer.
Got the floor plug seam-sealed in place:
Seam sealed patch (brushable seam sealer)
More seam sealing – the black is not brushable – I used a tube\caulk gun: The inside should be good now as far as seam sealing goes. Will see if the weather permits for more work on Labor Day weekend!