(I think these pictures are too big, but I've spent enough time putting this thing together, so here we go!)
I used a hybrid approach. I had the doors, engine lid, headlight covers and blinds dipped. These were easy to get primer into the cracks and crevices, because you could rotate them every which way and slosh the primer around.
I went to Redi-Strip. They have franchises in a handful of places around the country. They advertise in Hemmings. They do the dipping in their caustic hot tub, followed by neutralizer, followed by some kind of phosphate (zinc?) dip that will buy you a few days to get it primed. They had a '64 1/2 mustang convert in the bath. It was hanging by chains, and the brew was bubbling. Reminded me of several Vincent Price movies I saw when was a kid.
The dipping AND the blasting of the trunk lids was all less than $400.
They also do blasting, anything from a small part up to a whole car. They were blasting a whole 1969 Dodge Dart when I was there. Can you believe that?
Click to view attachment Click to view attachmentI had the two trunk lids blasted. Originally, I was going to dip them as well, but I talked myself out of it because of the areas in the channels that I doubted I could clean thoroughly or repaint thoroughly.
The rest of the upper exterior body, namely the fenders, I hand sanded. Not much sheet metal to sand when the other stuff is off.
Click to view attachmentInterior of the trunks, hellhole, etc were different. The car was Ziebarted back in '79, so all I really needed to do was soak that stuff off. What a mess, but underneath was like-new white sheet metal (original color). Some light sanding finished it up.....
Click to view attachment Click to view attachmentClick to view attachment Click to view attachment All I did to the underside was clean and re-undercoat. My car had rust on one jack point, and some surface rust under the battery.
Not the case with a lot of 914s, but the point I'm making is that you don't have to do the whole car using one set approach.....
Good luck! Better you than me! Lots of work.