A PA12 PLT RPTS FLYING OVER A TAXIING C172 AT PNC WHILE ATTEMPTING TO LAND ON A GRASSY PORTION OF THE ARPT.

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I WAS APCHING THE PNC ARPT FROM THE E AT 5-6 MI DISTANCE; INBOUND FOR LNDG. AT THAT POINT A CESSNA CALLED IN AT 5 MI S; INBOUND. I THEN CALLED IN AND RPTED MY LOCATION AND INTENTIONS TO LAND. AS I WAS XING THE S END OF THE ARPT; HE RPTED ON A MID-FIELD R DOWNWIND FOR RWY 17 (THE APPROPRIATE PATTERN FOR PNC RWY 17). AT THAT POINT I RPTED MY POS AND THAT HE WAS IN SIGHT AND THAT I WOULD FOLLOW HIM IN AND LAND #2 BEHIND HIM. UPON TURNING DOWNWIND; I ONCE AGAIN ANNOUNCED MY POS AND MY INTENTION TO LAND ON THE GRASS ON THE W SIDE OF THE MAIN RWY BTWN IT AND THE MAIN TXWY. I CONTINUED IN THE PATTERN BEHIND THE CESSNA AND SAW HIM LAND AND ROLL OUT NEAR THE APCH END OF THE RWY. I THOUGHT HE WOULD TAKE THE FIRST TURNOFF TO THE MAIN TXWY; BUT INSTEAD HE CONTINUED TO TAXI SLOWLY DOWN THE MAIN RWY AND START TO TURN OFF AT THE SECOND TURNOFF; WHICH ALSO SERVES AS THE N BOUNDARY OF THE GRASS AREA AVAILABLE TO THOSE WHO WISH TO USE IT. AT THIS POINT; I WAS APPROX ONE QUARTER MI FROM AND 200 FT ABOVE MY INTENDED TOUCHDOWN POINT. I RECOGNIZED THAT THEY COULD NOT SEE ME AND THAT THERE WAS A POTENTIAL CONFLICT IN THE MAKING. I ALSO THOUGHT THAT THEY WOULD BE ON THE MAIN TXWY BEFORE I NEEDED TO CROSS THE ACCESS TXWY TO LAND. I MANEUVERED TO THE L BACK OVER TO THE R SIDE OF THE MAIN RWY AND HELD MY ALT AT APPROX 100 FT AGL IN ORDER TO INCREASE THE SEPARATION BTWN OUR 2 ACFT. AFTER XING BEHIND THEM AS THEY WERE TURNING ON TO THE MAIN RWY; I THEN QUICKLY MANEUVERED BACK TO THE R OVER THE GRASS AREA AND SLIPPED MY ACFT IN FOR A NORMAL LNDG ON THE L SIDE OF THE GRASS WELL DOWNFIELD FROM THE NORMAL TOUCHDOWN POINT AND WELL AHEAD OF THE ACFT ON THE TXWY TO MY R. I HAD THE OTHER ACFT IN SIGHT ALL OF THE TIME UNTIL THEY DISAPPEARED BEHIND ME. I ALSO FELT THAT THEY WOULD NOT SEE ME UNTIL I APPEARED IN FRONT OF THEM; EITHER ABOUT TO TOUCH DOWN OR ON ROLLOUT. IN RETROSPECT; I PROBABLY SHOULD HAVE EITHER LANDED ON THE MAIN RWY OR EXECUTED A GAR AND RETURNED TO LAND. AT THE TIME; I FELT THAT THERE WAS NO DANGER OF COLLISION BECAUSE THEY WERE ON THE MAIN TXWY AND I WAS WELL AWAY FROM IT. I HAD TAKEN PRECAUTIONS TO INCREASE THE SEPARATION BTWN US AND COULD SEE THE OTHER ACFT ALL OF THE TIME UNTIL I WAS WELL PAST IT. IN THE FUTURE; I WILL USE MORE DISCRETION AND MAINTAIN MUCH GREATER SEPARATION DISTANCES IN SITUATIONS SIMILAR TO THIS SHOULD ONE ARISE AGAIN.