Short to Long Conversion?

[Mayo]

Hey guys, I found this clean 72 C10 that I want to get. I really like this truck except for one thing, its a shortbed and I much prefer longbed trucks. With that said, has anyone ever converted a shortbed into a longbed? If so, how'd you do it? I was sure if it would be easier to find a good 127" wheelbase frame or cut and lengthen the existing shortbed frame. The next issue is the bed. Would it be worth it be worth it to cut and extend the bedsides or just go out and find a clean longbed to swap on. Any help is greatly appreciated. Thanks