Wow. A legend? I don't know about that as I can't think of anyone in the Fett community I would consider a true "legend", but Sgt Fang is very well known for providing a low-cost copy of the mystery helmet to the masses. Anyone who sells product on a regular basis is going to have some amount of notoriety simply due to their name being attached to the item they sell. Sgt Fang is no exception as he has been selling for quite a while.
For me, someone like Mark Bradley, Tim Arp, or Dustin Crops Boy would be the closest thing I can think of to a Fett legend as they were doing this way back when reference was much more scarce, the internet was in its infancy, and boards like this were few and far between. Still, these guys were somehow able to produce amazing costumes that inspired the next generation.