After a little research, and close observation, the '99 900RR seems to be an eclectic mix of body parts. The nose fairing is obviously out of place, but doesnt look bad. The tail piece appears to be off of a 98, as does the lower side fairings; hence, no white. Even if the nose fairing was yellow, l havent seen a combination of the big Honda wing on the side, but no white.
If it was mine, l would be tempted to have the nose fairing painted yellow, as it should be. But, it may be more interesting just the way it is.