Sweet looking truck.. you mentioned you thought it was super solid but were mistaken... tbh with you, that WAS a pretty solid truck in comparison to many I have worked on. Normally I have to put floor pans and complete rockers/cab corners in them and work my way up from there. That was a nice truck to start your project with.
24 years ago, I rebuilt a harley in the living room/kitchen.. wife hasnt allowed parts of any type in the house since then.. had to build a shop