AN FK100 FLC DSNDS BELOW THE ASSIGNED ALT WHEN VECTORED FOR AN APCH TO A CHANGED RWY AT CLT; NC.

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WE WERE ON RADAR VECTORS FOR RWY 36R AT CLT ARPT ON A CLOSE-IN BASE. APCH TOLD US THE RWY WAS CLOSED FOR SNOW REMOVAL AND SWITCHED US TO RWY 36L. THE CAPT WAS FLYING AND WAS BRIEFING THE APCH. HE SET 1900 FT IN THE ALT SELECT; AND I WAS LOOKING AT THE APCH PLATE; ALSO APCH CTL GAVE US 2900 FT. APCH TOLD US TO MAINTAIN 2900 FT AND WE NOTICED WE WERE AT ABOUT 2200 FT -- WE WERE INTERCEPTING THE INBOUND COURSE AND ALMOST AT GS INTERCEPT. WE CLBED UP; SHOT THE APCH; AND LANDED. WE SAW THE ARPT AT ABOUT 1900 FT. THE LATE RWY CHANGE AND NEW APCH BRIEFING; AND RADIO AND FMS PROGRAMMING AT ABOUT THE SAME TIME AS GS AND LOC INTERCEPT WAS A CONTRIBUTING FACTOR. WE DID NOT HAVE THE TIME WE NEEDED TO PROPERLY BRIEF; TUNE; PROGRAM; AND IDENT -- AND IN A HURRY TO DO SO; I MISSED THE CAPT'S SETTING 1900 FT INSTEAD OF 2900 FT. WE ALSO WERE ON A LIFEGUARD FLT. WE WAITED FOR KIDNEYS NEEDED FOR A TRANSPLANT AND WERE ON OUR LAST LEG HOME OF THE 3-DAY TRIP. THE WX; RWY CLOSURE; AND FAIR BRAKING RPTS WERE ALSO ON OUR MINDS. THE NEXT TIME I GET RUSHED LIKE THIS; I WILL ASK FOR A VECTOR FOR MORE TIME TO SET UP FOR THE APCH. WE NEVER HAD A GPWS WARNING AND WERE APPROX 1500 FT ASL AT THE LOWEST ON FINAL.