C441 PLT HAS A RWY INCURSION AT PDK.

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AT DEKALB PEACHTREE ARPT; GA; I WAS GIVEN DEP TAXI CLRNC 'TAXI TO RWY 2R; HOLD SHORT OF RWY 2L....' I BEGAN TAXIING FROM FBO ON THE TXWY IN FRONT OF THE CTL TWR (TXWY B) AND INSTEAD OF MAKING THE HALF R TO PICK UP TXWY A; I MISSED THE HALF R AND CONTINUED STRAIGHT AHEAD ON TXWY B. I SHOULD HAVE BEEN APCHING THE INTXN OF RWYS 9/27; WHICH WERE CLOSED; BUT I WAS MISTAKENLY APCHING RWY 2L. AS I RECOGNIZED WHAT WAS HAPPENING; I BEGAN TO STOP AND THE GND CTLR CALLED AND SAID 'HOLD YOUR POS' WHICH I HAD DONE AND ACKNOWLEDGED. THE GND CTLR THEN INSTRUCTED ME TO TAXI S ON RWY 2L TO THE FIRST TXWY TO THE R; TXWY C; TAKE IT TO TXWY A; AND TO CONTINUE TAXIING ON TAXI A TO THE END OF RWY 2L; HOLD SHORT OF RWY 2L AND MONITOR TWR. MY ACFT WAS PAST THE MIDFIELD HOLD SHORT LINE FOR RWY 2L ON TXWY B; BUT HAD NOT ENTERED THE RWY WHEN I STOPPED BECAUSE IT DIDN'T LOOK RIGHT. IN THIS AREA; TXWYS AND RAMP RUN TOGETHER AND ARE NOT EASY TO FIGURE OUT. AS I WAS TAXIING OUT; THE CTLR WAS COMMUNICATING WITH ANOTHER ACFT WAS PERHAPS DISTR BY THAT ACFT AS I PASSED JUST BELOW AND IN FRONT OF THE TWR. I WAS DISTR BY A BLIMP WHICH WAS APCHING THE PDK AIRSPACE FROM THE E; AND BY MY PAX SITTING IN THE COPLT SEAT WHO WAS MAKING SEVERAL OBSERVATIONS ABOUT THE BLIMP'S NOSE DOWN ATTITUDE; AND ABOUT THE AIR CONDITIONING SYS WHICH WAS NOT PROVIDING COOL-ENOUGH AIR TO THE CABIN TO SUIT HIM. THERE WAS NO ARRIVING OR DEPARTING TFC ON RWY 2L WHEN THIS EVENT OCCURRED. HOWEVER; IT WAS AN ACTIVE RWY. I WAS MISTAKEN ABOUT MY EXACT POS ON THE ARPT AND THAT IS THE REASON FOR THIS RPT.