Well it has around 3300+, but alot of them are animations for the different enemies.
So that would be cut down if 3d models were made for the enemies, weapons and items.
Edit: I just got an e-mail from birger:
"Start 'winrottgl 1.40' and set the menuitem 'Use external GFX' and start the game.
Now rott will extract all GFX (only if no folder exist) from the game in a new subfolder named 'GFX'.
It might take a couple of minutes to extract all these pictures.
Exit the game and you can now alter all the bmp's in these subfolders with only one
things to caution namely the releation between Height and Width.
It must be the same as the extracted one's, so if you have a 20 x 40 pixel picture you must use
a picture that is 40 x 80, 80 x 160 and so forth."
Ok, so this'll be the start of Rott HRP.