PLTS OPERATING A VFR FLT BECOME IMC AND UNABLE TO MAINTAIN MSA.

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ON APR/SAT/02; A STUDENT AND I DEPARTED FOR DESTIN; DTS. AN AIRMET WAS OUT FOR IFR; BUT CONDITIONS WERE EXPECTED TO END BY OUR ARR TIME. WE DEPARTED ON THE DAY DUAL COMMERCIAL XCOUNTRY WHICH MUST BE OVER 100 NM. ENRTE CONDITIONS BECAME MARGINAL AND WE WERE VFR ON TOP OF A THIN BROKEN LAYER FOR ABOUT 20 MINS. DESTIN WAS RPTING 500 FT BROKEN WHILE CRESTVIEW WAS VARYING BTWN 500-900 FT BROKEN. WE DECIDED CEW WAS WORTH A SHOT SINCE DESTIN WAS NOT VFR. WE FOUND A LARGE HOLE IN THE CLOUDS W OF CEW AND DSNDED. WE WERE SCUD RUNNING TO THE ARPT AND HAD THE ARPT IN SIGHT AT 5 MI OUT. CEW IS CLASS E TO THE SURFACE BUT HAVING FLOWN THERE MANY TIMES BEFORE; I WAS UNDER THE IMPRESSION THAT IT WAS CLASS G UNTIL 700 FT AGL. WE WERE UNABLE TO MAINTAIN VFR AND OUR MSA AT THE SAME TIME. IN HINDSIGHT; WE SHOULD HAVE CIRCLED ON TOP FOR A WHILE BECAUSE CONDITIONS IMPROVED WITHIN 20 MINS. WE ALSO COULD HAVE LANDED ELSEWHERE OR GOTTEN AN SVFR CLRNC SINCE IT WAS A CLASS E SURFACE AREA ARPT. THAT WOULD HAVE MADE US LEGAL. THIS WAS MY FIRST TIME SCUD RUNNING AND DEFINITELY MY LAST. IT WAS A VERY UNCOMFORTABLE SIT.