CMH CTLR DESCRIBED GND CONFLICT; INDICATING THE PRIMARY PROB WAS THE RESTR TWR VISIBILITY TO ALL LOCATIONS ON THE ARPT.

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I WAS WORKING LCL CTL. GND CTL HAD A C172 WAITING TO CROSS RWY 10L NEAR THE DEP END; AND HAD COORDINATED XING J2 TO E1. MORE TIME THAN USUAL WAS NECESSARY DUE TO CONSTRUCTION; WHICH CLOSED E2; THE TXWY INTXN DIRECTLY OPPOSITE J2. THEREFORE THE C172 WOULD HAVE TO CROSS RWY 10L BY TAXIING ON THE RWY FOR 1000 FT TO THE END; AND TURN R AT E1. A CPR JET (CJ) THAT WAS DESTINED TO AN FBO ON THE N SIDE LANDED RWY 10L; AND WAS SLOWING TO TURN L AT THE LAST EXIT TO THE L (J2). A REGIONAL JET (RJ) WAS ON FINAL FOR RWY 10L; APPROX 5 MI BEHIND THE CJ. EARLIER; GND CTL HAD COORDINATED XING THE C172 AFTER THE CJ LANDED; AND BEFORE THE RJ WOULD CROSS THE THRESHOLD. THIS WOULD'VE WORKED WELL HAD THE CJ BEEN ABLE TO EXIT PRIOR TO J2. HOWEVER; THE CJ WAS TOO FAST TO EXIT AT J3. BEING AS THE CJ COULDN'T MAKE J3; I TOLD THE PLT TO HOLD SHORT OF J2 SO THAT WE COULD GET THE C172 TO CLR THE INTXN (AND HURRY DOWN THE RWY TO CROSS). HOWEVER; I COULDN'T GET GND CTL ON BOARD WITH THIS PLAN QUICKLY ENOUGH. THE SITUATION WAS NOW RAPIDLY DETERIORATING; AS THE CJ WAS SLOWING TO A STOP; 1000 FT FROM THE END. HIS IMMEDIATE EXIT TO THE L WAS BLOCKED BY THE C172; AND HIS IMMEDIATE EXIT TO THE R WAS BLOCKED BY CONSTRUCTION. I ATTEMPTED PLAN B BY ASKING THE RJ TO LAND RWY 10R. THE PLT SAID UNABLE. BEFORE I HAD TO SAY 'GO AROUND' I ASKED THE CJ IF HE COULD EXIT L; AND GET BY THE C172. HE MANAGED TO DO THIS. THE 'GAR' DIDN'T HAVE TO BE ISSUED. GND CTL APOLOGIZED FOR THE MESS; AS THE C172 WOULDN'T HAVE BEEN THERE IF IT HADN'T BEEN FOR HIS EARLIER ERROR. WHAT OCCURRED EARLIER WAS THE C172 HAD LANDED RWY 10L; AND EXITED TO THE R AT E4. THIS ACFT HAD TO TAXI TO THE S SIDE OF THE ARPT. I HEARD GND CTL CLR THE ACFT TO TAXI AND HOLD SHORT OF RWY 10R AT TXWY F. APPARENTLY; NOT LONG AFTER THAT; GND CTL CLRED 2 RJ'S TO TAXI TO RWY 10L; AS GND CTL FOUND HIMSELF FACED WITH THE C172 AND 2 RJ'S; HEAD-TO-HEAD ON TXWY E. GND CTL RESOLVED THIS BY GETTING MY APPROVAL TO CROSS RWY 10L WITH HIS C172 AT E3-J3. THAT'S HOW THE C172 ENDED UP AT J2; IN THE WAY. GND CTL GOT HIMSELF INTO THIS POS BECAUSE OF TWO REASONS. ONE; HE SIMPLY FORGOT ABOUT THE C172. AND TWO; BECAUSE THE VIEW OF TXWY E; WHERE THE C172 WAS; IS OBSTRUCTED FROM VIEW FROM THE GND CTL POS. MASSIVE PORTIONS OF OUR MOVEMENT AREAS (TXWYS AND RWYS) ARE OBSTRUCTED FROM VIEW BY OUR ILL-DESIGNED TWR CAB. TO VIEW ALL OF OUR MOVEMENT AREAS; ONE HAS TO CONSTANTLY PACE FROM THE N SIDE OF THE TWR CAB TO THE S SIDE OF THE TWR CAB (OR STAND ON THE 13 INCH RISER). RARELY DO CTLRS USE THE RISER AND RARELY DOES ANYONE PACE BACK AND FORTH. INSTEAD; MEMORY IS RELIED UPON.