THE FLT HAD NOT YET BEEN SCHEDULED WHEN THE PLT RETIRED FOR THE EVENING AT 2230 TO 2300 EST. AT 0230, HE WAS AWOKEN & NOTIFIED TO MAKE A NGT CARGO FLT. THE OWNER OBTAINED A WX BRIEFING & FILED A FLT PLAN, THEN BRIEFED THE PLT LATER. THE PLT ARRIVED AT THE ARPT AT 0430. HE PREFLIGHTED THE ACFT WHILE THE OWNER UPDATED THE WX BRIEFING. THE ACFT WAS CLEARED AS FILED WITH A CLEARANCE VOID TIME OF 0500; THE CLEARANCE WAS RADIOED TO THE PLT BY UNICOM. DURING TAKEOFF,AT 0510, THE ACFT WAS OBSERVED CLIMBING NORTHBOUND TO APRX 800' AGL IN MODERATE SNOWFALL WITH THE LANDING LGT ON. A SHORT TIME LATER, THE ACFT CRASHED APRX 1 MI NE OF THE ARPT WHILE IN A STEEP NOSE DOWN, RGT WING LOW ATTITUDE. NO PRE- IMPACT PART FAILURE/MALFUNCTION WAS FOUND. REPORTEDLY, WHEN THE PLT 1ST HIRED ON, HE EXAGGERATED HIS FLT EXPERIENCE; HE HAD PROBLEMS WITH INSTRUMENT FLYING & WAS NOT SCHEDULED FOR FLTS IN MARGINAL WX; & HE WAS GIVEN EXTRA HELP. AT THE TIME OF THE ACDNT, SNW WAS FALLING, MIXED ICING WAS FORCAST IN CLDS & THERE WAS A SIGMET FOR MOD TO SVR TURBC BELOW 8000'.