I wouldn't worry too much about acceracy myself if you lack the materal to do so...
Many people kinda forget that MUGEN's ment for new creations...not converting whats already made! XD
Though by using said sprites it WOULD be nice if he was somewhat close to his real verson.
But KOF2003?...Doesn't MAME have that? You could DL it and get proper val's and timings from it and use a Gfaq for move lists.
...Also it seems Elix knows quite a bit about KOF..why not sit down with him to see if you can't get a bit more help...
THEN again this is if you wish to make a converson...im not stopping ya if you deside agenst! =p
Felicia---75% (programmings going well..in a few months she MIGHT be ready for a releace.)
Q-Bee---60%( Programming specal attakcs now)