PLT OF TBM7 ON VOR RWY 23 APCH TO FWA DSNDS TO MDA VICE FINAL APCH FIX ALT PRIOR TO FAF.

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I WAS CLRED FOR A VOR APCH TO RWY 23 AT FWA. VECTORS WERE PROVIDED FOR THE INTERCEPT AND THE AUTOPLT CAPTURED THE COURSE WITHOUT INCIDENT. APCH PLATE WAS GIVEN A CURSORY REVIEW AND THE AUTOPLT PRESELECT SET INCORRECTLY TO THE MDA ALT OF 1300 FT MSL (1260 FT MSL). APCH CONTINUED WITHOUT INCIDENT UNTIL TWR ADVISED A 'LOW-ALT ALERT.' ALTIMETER SETTING WAS VERIFIED AND ALT WAS VERIFIED. SHORTLY THEREAFTER; TWR ADVISED THAT 1520 FT MSL WAS THE PROPER ALT 'TIL THE FAF; HOWEVER THE CTLR SAID THAT 'I'M SURE THERE ARE NO TWRS OUT THERE.' APCH HAD REACHED FAF AT THAT POINT AND THE APCH CONTINUED UNTIL A MISSED APCH WAS CALLED DUE TO DETERIORATING WX. NO OTHER STATEMENTS FROM TWR WERE RECEIVED. FLT WAS CONDUCTED AS A DEMONSTRATION FLT TO A PERSPECTIVE BUYER. BUYER WAS FAMILIAR AND HOME-BASED AT FWA; YET I DID NOT ENGAGE HIS SVCS DURING THE APCH (IE; REVIEWING THE PLATE WITH ME; CALLING OUT ALTS FOR ME; ETC). BECAUSE I HAD QUICKLY LOOKED OVER THE PROFILE VIEW OF THE PLATE; I DID NOT CORRECTLY IDENT THE PROPER ALT OF THE FAF AND HAD INSTEAD IDENTED AND DSNDED TO THE MDA UPON INTERCEPT OF THE FINAL APCH COURSE. AS A CFII; I KNOW; AND SHOULD HAVE KNOWN; THE IMPORTANCE OF PROPER PLATE REVIEW. FURTHERMORE; I DID NOT USE ALL MY 'COCKPIT RESOURCES' DURING THE APCH. A MORE CAREFUL REVIEW OF THE PLATE; ALONG WITH A REVIEW OF THE PLATE WITH ANOTHER PLT WHEN ON BOARD; WOULD HAVE PREVENTED THE ACCIDENTAL EARLY DSCNT. THIS IS HOW CFIT HAPPENS AND I GOT A GOOD TASTE OF HOW IMPROPER AND RUSHED APCH PREPARATION CAN AFFECT THE SAFETY OF A FLT.