kanuist:
First of all, welcome to the Forum for what I consider to be the finest pocket pistol on the planet.
To answer your questions in the order presented:
1. This link will show what one owner/member has had done to one of his R9s:
http://www.rohrbaughforum.com/YaBB.cgi?board=R9S;action=display;num=1208438007;start=152. I've owned my R9 No. 132 since May 2004 but have never bench tested it. Nonetheless, I find it to be suprisingly accurate for being the smallest and lightest 9mm pistol yet produced.
3. I stopped keeping track of the rounds put through my R9, but after gaining what I felt to be complete familiarity with it I adopted the practice of shooting it only occasionally to retain familiarity. However, since it is my 24/7 piece, I maintain it with what might be called obsessive care.
4. My primary is a 1911 which has been given "the works," including a "Meltdown Package" by Clark Custom Guns, a Cylinder & Slide SFS System, and a LaserMax sight, but I consider my R9 to be perfect as it is and in need of no modification.
5. Pulling my R9 from my pocket and simply measuring its width with the ruler on my desk, I find that it appears to be 3/4" in width at both slide and grip. More information, of course, can be found at the company's website:
http://www.rohrbaughfirearms.com/