yep, that's the very first mod I did to my van also
People asking about what tools to use?
I used a 24tpi blade in a jigsaw
It's a metal cutting blade and it cut like butter
Blue painters tape to draw the line on
Drill some 3/8 inch diameter holes in the corners
The roof steel is not very thick
I kept my knees on some carpet and on top of the cross beams for support and it was no problem being on the roof
Wear some knee pads to cushion your knees
People asking about what tools to use?
I used a 24tpi blade in a jigsaw
It's a metal cutting blade and it cut like butter
Blue painters tape to draw the line on
Drill some 3/8 inch diameter holes in the corners
The roof steel is not very thick
I kept my knees on some carpet and on top of the cross beams for support and it was no problem being on the roof
Wear some knee pads to cushion your knees