1948 GMC frame questions

[DS3685]

Hi guys Im looking for some information and possibly photos of shortening a LWB frame down to the SWB frame. The customer wants to shorten the frame doesnt want to do an s-10 swap or look for a SWB frame....very adament about using his....customer is always rite....Anyhow Ive been searching and reading and all the posts seem to all start with good info and then it turns into the cut here dont cut here do a straight cut dont do a straight cut...or the debate of not shortening the frame starts....Does anyone have any solid info on the best place to take the frame section out or pictures? Im just looking to do some research and gain as much info as possible before I start the project. Thank you