Actually made some REAL progress last night. cut out the battery try, cab mount, and a bit of the core support. . next up is to finish cutting the scraggly bits of rusted sheet on the Cab mount, then rust Neutralizer on it. after that, making new panels for what I have cut out. I am moving the battery to a box in the bed, so no need to "Replace" the tray, just the sheetmetal underneath.
Still a bit of Pitted metal, but not alot. i reckon a neutralizer, and body filler after i fix the surrounding area should fix it right up.
Cab mount looks a bit Boofed. but it still feels super solid, so it will go back in. just after it gets some more love