Crew cab ?

[PaRedneckRiders]

Ok so i have a few questions.
Well first off im wanting to build a crew cab but, if i were to want a short bed crew cab single rear wheel what would be the easiest way to do it.

I would guess shortening a crew cab frame but could i start with an 8ft bed chevy frame if so would i have to lengthen it and how much. Im having a real hard time finding decent crew cabs and was thinking mayb i could start with something different but still end with the same product.