/\ that.
all the major components will bolt right on...suspension/engine/steering/plastics ect.
it's mainly the hood and rear brake that'll need attention
the mountings for the electronics under the hood are different (easy fix) i might even have that piece i cut off ??
the bracket for the brake line is on your steering stem mount i believe.
there will be 2 hood mounts on the sides missing (lots of guys run 03 hoods on 02 frames without them)
and the rear master mount (i can help you there, bolt on or weld on)
i went over my 05 frame and cut off what wasnt needed, then welded tabs on where needed (hood & electronics), before it got painted
fairly simple mods
i have pics of an 03 frame, and a bare 99 layin at the shop, maybe i could make a comparison pics post/thread ??