Nice truck great story and family history behind it
My truck i am replacing the back frame cross members to a pair i salvaged from a square body suburbon to make installing burbon gas tank easer and make it look dtock
Poor aftermarket door fitment i would look at repairing your stock doors
Talking to a bodyman years back about restoration of classic trucks he brought up always replace cab corners and rocker panels on the fact you would hate to have those rust out after 2 to 5 years after you finish with new paint
Door repair
https://m.youtube.com/watch?v=D74PBZaAdfI