help !!!!

[Ghost 65]

I have been looking at everyone's projects and was hoping you could help answer some questions for me. I have a 65 chevy C 50 dump that belonged to my great grandfather. I am very suprised at the good condition that it is in after all these years. It has very little rust especially considering that it has spent its entire life here in Virginia.
I have been trying to figure out what to do as far as restoration goes. I am hoping that I can make a crew cab out it and put a more modern drive train in it because I would like to be able to afford to drive it occaisionally because it currently only gets about 5 mi. per gallon. As well as get rid of the flat bed and use a longbed fleetside that also dumps.

My questions are :
1. Does the 50 cab have the same deminsions and lines as the 10 & 20 c's
2. Do the doors on the 63 have the same lines as the 65 body style. (looks like those doors would work better for making a crew cab.

I haven't started this project yet. I'm trying to start acquiring some parts.

Thanks for your help,
Chris