TWR CTLR-IN-CHARGE (CIC) INVOLVED WITH RWY INCURSION WHEN LCL CTLR MISSES MAINT. VEHICLE INCORRECT READBACK DURING TWR RETROFIT CONSTRUCTION.

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IN GENERAL; BECAUSE WE ARE UNDERSTAFFED; THE TWR CTLR-IN-CHARGE (CIC) IS ALWAYS WORKING THE FLT DATA/CLRNC DELIVERY POS. THIS IS NOT A GOOD SIT. A 3RD SET OF EYES IS NEEDED TO AFFORD PROPER SAFEGUARDS (IE; THE CIC SHOULD NOT BE (COMBINED WITH OTHER POS). SECONDLY THE RWY CONFIGN MOST COMMONLY USED AT CRW ILS RWY 23/33. THIS CONFIGN HAS BEEN AN ON-GOING PROB SINCE RWY 33 WAS REALIGNED YRS GO. PLTS ARE CONSTANTLY ASKED TO RESTATE THEIR RWY REQUEST AND OFTEN READ BACK THE WRONG RWY. IN ADDITION; TO THESE CHRONIC PROBS; THE TWR CAB IS BEING REFITTED (AS IS THE WHOLE FACILITY) AND AT THE TIME OF THE INCIDENT; THERE WAS AN FE TECHNICIAN ON A LADDER AT THE LCL CTLR POS; ANOTHER SPREAD EAGLE ON THE FLOOR AT (AND UNDER) THE FD/CD/CIC POS AND AN AIRWAYS FACILITY TECHNICIAN BTWN THE 2. THEY WERE TROUBLESHOOTING AN ELECTRICAL PROB THAT OCCURRED DURING THE REFIT AND THEY WERE SHOUTING BACK AND FORTH AT EACH OTHER (THIS WAS NECESSARY BECAUSE 1 TECHNICIAN'S HEAD WAS UP IN THE CEILING TILES AND THE OTHER'S HEAD WAS IN AND UNDER THE TWR CONSOLE. AS FOR THE INCIDENT; AN FAA VEHICLE WAS INSTRUCTED TO HOLD SHORT OF RWY 33 FOR DEPARTING TFC (NAVAJO). THE VEHICLE READ BACK RWY 23 AND CROSSED RWY 33 IN FRONT OF THE NAVAJO; WHICH WAS ROLLING (BUT NOT YET ROTATED). DUE TO THE INORDINATE BACKGROUND NOISE; OBSTRUCTIONS TO VISION (THE LADDER) AND SEVERAL CONFUSION; THE LCL CTLR DID NOT CATCH THE ERRONEOUS READBACK. HAD A THIRD CTLR BEEN PRESENT; THIS INCIDENT WOULD MOST LIKELY BEEN PREVENTED.