Fiberglass the frame. No welder needed to cover holes...
Below is an old thread. I'm sure there are more threads /ideas...
You can still use the black textured paint to keep the glare down or find someone to cover the dash in marine grade UV resistant vinyl.
http://67-72chevytrucks.com/vboard/s...=441581&page=2
http://67-72chevytrucks.com/vboard/s...d.php?t=592107