Kevin,
Very interesting to read what is (or could) still be out there. I think I have posted all I know in the threads
"Yankee Joe" truck and
GMC 4x4 Cargo Truck (over on the GMC CCKW forum).
Not sure what you mean by "CCK-323" in the title; you surely must mean CCK-353? Anyhow, I am looking forward to seeing your pictures.
Just for reference, I have attached some pictures of the GMC ACK-353 1-1/2 ton 4x4 Cargo Truck.
Hanno