Body panel screw holes: Match pattern, or patch and make new ones?
Heya folks! I raised the roof on my 1993 Thomas Minotaur - The Struggle Bus.
The plan right now is to reuse the existing windows, sills, small panels like the ones that go between the windows, basically everything I can, and over time as I live in it and get a feel for what I want the interior layout to be I will remove windows, get new ones, cover as necessary. Basically, I'm trying to defer big decisions until I'm sure what I want.
The topic in my mind right now, and I've been searching the forums and googling to no avail on the best practice here: I have the window sill pieces that were screwed into the top of the existing body panel with #10 screws. I am adding a 16" high body panel, which will be screwed into the top of the existing panel, and the sills will be screwed into the top of the new piece... pretty straightforward splice. Now, do I want to match the screw holes in the body panel and sills in the new piece, using transfer screws or something similar, or do i want to patch the old holes (I have a welder and a bunch of Bondo, would Bondo be fine or would I weld those holes full?) and then start with fresh pilot holes? A third option would be to do new holes where the new panel overlaps the old one, ignoring the existing holes since they'll be covered and the joint will be full of butyl tape, and treating the holes in the sills as oversized clearance holes and piloting the new sheet through those holes.
Tons of ways to skin this cat, and I can't for the life of me find any good references!
I imagine that reusing old screw holes, with or without going up a screw size, would risk mangling the steel and making a loose screw, or slight misalignments could pull the sheet around in weird ways and make it lumpy/wrinkly. But on the other hand, if I'm overthinking things (as I often do), it will help me avoid a weird patchwork of Bondo or days of MIG filling old holes.