making a shortbed out of a longbed

[my67C10]

im not really into the look of the longbed so i have been thinking on this for a few weeks, first i thought of just finding a shortbed frame and making the chopping and welding the bed but then i came to the conclusion that it would be alot easier to just cut the frame and weld it back. i found this guy is selling this guid on how to make a short bed out of a long bed and i would rather just do it on my own (i am using a few pics as a refrence) i just need to know the wheel base of a shortbed. i went to school with this guy who made a shortbed out of his 68 longbed, but he had air bags with 1" ports so after 3 or 4 years it tweaked the frame and it snapped in 2 places one being in a place where it wasnt cut and welded. i think im going to talk to him and ask to get some coppies of the pics that he took while it was under construction, im not sure if he just mader vertical cuts or if they where at an angle but its common knolage that the more area that you weld the stronger the weld is going to be. the best way to cut it in my mind is to make a stretched out horizontal S. something like this pic (thanks flebay guy)