Found dmadesign.net which is hosted by a former DMA member. There are few relevant GTA posts but I thought 2 stood out.
The source image for the "Gun" promotional art...
Promo Image: Source Image:
There were also story notes about the Vice City portion of the game including character and gang descriptions and missions.
I won#t copy it here as it is pretty lenghty but you can read it in the link below.
P.S. If these have already been found then feel free to call me a dumbass