I don't claim to have any fame on the game, but I have been playing since 1st edition, still have all the core books. My 'claim to fame', should it be called such a thing, to the Ars Magica community, was the invention of what was referred to as "Ars Fantasy". A system that converted Ars Magica into a fantasy setting. It included some basic rules on how to add races to the game, but more importantly, it did to combat what the Magica system did to magic. 5 Techniques: Defense, Power, Precision, Speed and 2Weapons. And 10 weapon categories, with rules on how to use those in combat settings...
I can't find the finished work, but I do see that I have a link to the old google-doc (though the font looks crazy now, wasn't like that when I created it :P). I was creating it on before it was finished... maybe I will go back and re-finish it...
https://goo.gl/4MZNqz