72 C10 shortbed conversion. This is the way I did my shortbed conversion. I went with the straight cut cause it was easier for me and it's the same way the shortbed kits do it.
Good job! Definitely had saved a few bills doing it this way. Your final cut at 4:25 on the frame, on the Brothers Trucks video, even they had gotten off on the last cut at the bottom, even with the template! So I wouldn't worry any, that's what a grinder is for.
Any where under the cab. The straightest spot is between front cab mount and rear trailing arm crossmember. I just measured about 4in in front of crossmember on each side. Draw a line and then measure 12 from there forward.
