If it were mine I’d use a cutting wheel on a Dremel and make the cut on the inside. The Dremel will do a lot less damage and is easier to handle in the tight space. Then I’d either fabricate an inspection plate/cover to cover the hole and paint it to match the truck (like a 4 x 4 metal electrical cover). If you have carpeting in the interior stockinteriors.com sells these carpet panels that will cover it up and you won’t see the access panel.

Good luck,
John

http://s783.photobucket.com/albums/...%20Pickup%20project/?albumview=slideshow


My Fleet:
1941
1953
1959
1965
1966
1953 Willy's Pickup

John

Vegetarian- old Indian word for bad hunter