Question... I Need Your Thoughts?

[67 cst swb]

OK, So I have a 1967 CST Long Box truck. It was originally a 327 TH400 3.73 posi. A different engine has been installed, but the Original TH400 and 3.73 posi are still there. I have the protect-o-plate and they do match. The SPID label is gone. It has been sitting at my place since about 1998 with the intention of building..."someday"
It has:
Buddy Buckets (need redone, as does everything on the truck)
Power Steering
Power brakes
Air Conditioning
Small back window

Only things of real value are the Buddy Buckets and the Posi rear end.
Of coarse there are numerous 67 only little items of value, but for the most part these are $5, $10, $25 dollar items.
The cab would need everything, such as rockers, corners, kick panels and maybe even a floor. Somewhere in its life, someone put cab lights on it and they have been removed an sitting with open holes since at least 1998 or longer. So who knows how much more damage has been done by rust that can't be seen. The long box is not usable, but I have it. The front end (fenders, grille and hood) is not usable, but I still have them, well, fenders at least.
Here is my question..
should I sell it whole as is?
Would it be better to just part it out?
Or should I just build it as a short wide box (my original thought) by using a different cab, shorten the frame and replacement body pieces.

As stated above, it doesn't have the SPID label anymore. So really if I change out the cab (even if I use the original VIN tag) its just a bunch of CST parts on a pieced together short box.
So, I guess I am wondering these values to decide if I want to build as described above or sell it to build one of my other non-CST trucks as a shortbox, just without the Buddy Buckets or Posi.

Thoughts?

CSR #1 with small back window