There is one 1024 bmp for the wings and one for the fuselage and tail. Then there are the specular, environment, power and normal bmps for each of those, which makes ten. Then there are copies of each of those with the damaged areas added which makes twenty. In reality it is not as much work as it sounds though. I made six files, two each of the diffuse, specular and normal maps, the other fourteen were just copies of those with some modifications.
I'd guess the eventual file size downloaded by players will be about the same as an AHIII 2048 res bomber skin.