How much rust is too much rust for a project.....?

[brawley]

I had what i thought was a good cab intil I had it soda blasted. water was trapped in the drip rail and rusted out holes that ended up coming through the pilars and rusting them out worse than I expected. but I've already gone so far with this cab - theres no turning back.I found a cab with a nice roof and windsheild pilars and was hoping to do some type of swap???? hopefully?? does anyone have any advise or good pics on this? thanks