SMA ATTEMPTING TO RECEIVE IFR CLRNC AFTER TKOF IS HANDED OFF; DOES NOT RECEIVE COMPLETE CLRNC.

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I FILED AN IFR FLT PLAN FOR XX30Z DEP ON JUL/MON/91. RTE DIRECT HTL DIRECT MANISTEE DIRECT MANITOWOC DIRECT SHEBOYGAN. I CONTACTED WURTSMITH APCH UPON DEPARTING 09 AND ASKED FOR CLRNC. I CLBED TO MY FILED ALT IN MARGINAL VFR. WURTSMITH GAVE ME A LCL SQUAWK. WURTSMITH ADVISED ME THAT CAN CENTER WAS TOO BUSY TO GET MY CLRNC AND TURNED ME OVER TO MINNEAPOLIS CENTER AT THEIR BOUNDARY. I CONTACTED ZMP AND ASKED THEM FOR MY CLRNC AND TOLD THEM MY PREDICAMENT. STILL MARGINAL VFR. THEY GAVE ME A NEW SQUAWK CODE AND TOLD ME TO MAINTAIN 6000 FT. WE ENTERED IMC W OF HTL AND PROCEEDED ON FLT PLAN WITHOUT CLRNC. CENTER CONTACTED ME SEVERAL TIMES AND CHANGED FREQ AT LEAST ONCE. APPROX 30 NM E OF NANCI TWR I AGAIN ASKED ABOUT MY CLRNC. THE CTLR ACTED SURPRISED THAT I DID NOT HAVE ONE AND GAVE ME ONE DIRECT MAN DIRECT SHEBOYGAN; WHERE WE LANDED WITHOUT FURTHER INCIDENT. AT SHEBOYGAN I MISSED THE VOR 27 APCH BECAUSE I DID NOT HEAR CHICAGO CLR ME FOR APCH IN TIME; HOWEVER; I HAD DSNDED OUT OF THE CLOUDS; HAD ARPT IN SIGHT; CANCELLED MY IFR PLAN AND CIRCLED TO LAND.