Rip, when working with your body, be sure that all your D nuts used mostly to attach trim and garnish pieces are firstly intact and wont drop out as I have discovered late in my build, but also check threads are not stripped or got broken off metal stuck inside.
I had a lot of trouble with D nuts around the rear window and garnish mould on the A pillars.
Cover plate panels on the B pillars also required a run thru with a tap.
I ended up purchasing some replacement D nuts from Snyders in Ohio, but have in desperation I have actually gone to the trouble of drilling out the center of a D nut and pressing a new piece of round bar into a drilled hole and the re-tapping it.
Some would call it dedication, but it ain't much fun...
Original D nuts were pressed in and burred over, but nowadays most folks just use a MIG weld to hold them in position.
I've wised up these days and can attach most small to medium size taps to my battery variable speed drill which is must quicker and easier to do.