PLT OF SMA AMPHIBIAN ACFT INADVERTENTLY LANDED THE ACFT GEAR-UP ON A LAND RWY DUE TO MONITORING THE ILS INST ACCURACY.

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I LANDED MY SMA ACFT AMPHIBIAN GEAR-UP AT AN UNCTLED ARPT (LEW) ON RWY 4. THE ONLY DAMAGE WAS TO THE KEEL STRIPS ON THE FLOATS DUE TO ABRASION ON THE CONCRETE SURFACE. OTHERWISE; THE LNDG WAS 'UNEVENTFUL.' HOW IT HAPPENED: I NORMALLY RECITE 'GREEN GRASS; BLUE WATER' TO MYSELF WHILE ON SHORT FINAL AS I LOOK AT THE GREEN LIGHTS (GREEN MEANS GEAR DOWN; BLUE MEANS GEAR UP FOR WATER LNDGS). HOWEVER; ON THIS OCCASION; I WAS FLYING DOWN THE ILS TO VERIFY CORRECT OP OF MY HSI INDICATOR WHICH HAD BEEN RE- INSTALLED THE PRIOR DAY FOLLOWING MAINT WORK ON IT. SINCE I NORMALLY LOWER GEAR ON DOWNWIND (VFR) OR OUTSIDE THE OM (IFR) I CHEATED MYSELF OF MY NORMAL ROUTINE BY INTERCEPTING THE ILS INSIDE THE OM IN VFR CONDITIONS. I GOT SO BUSY MONITORING THE GS AND LOC; THAT I DID NOT GO THROUGH MY NORMAL PRE-LNDG CHKLIST WHILE FLYING THE 'HEADS-UP' ILS. THERE WAS A FAIRLY STIFF XWIND THAT REQUIRED LOTS OF ATTN. WHEN THE ACFT CONTACTED THE RWY; I FIRST THOUGHT I HAD A FLAT TIRE ON 2 ON THE MAIN GEAR. ONCE I REALIZED MY MISTAKE (IN ABOUT 3 SECONDS); I LET THE ACFT COME TO A COMPLETE STOP IN ABOUT 200 FT. BECAUSE THE LCL FBO MECH HAD TO COME OUT ONTO THE RWY AND JACK THE PLANE UP SO THE GEAR COULD BE LOWERED; THE RWY WAS OUT OF USE FOR APPROX 30 MINS. SOMEONE AT THE FBO IMMEDIATELY CALLED THE FAA FSDO IN PORTLAND; ME; TO NOTIFY THEM. HOW I WILL PREVENT RECURRENCE. I'M GOING TO GET REFRESHER TRAINING AND WILL NEED TO TAKE AN FAA RE- EXAMINATION. I WILL TAKE MORE TIME TO FLY MY NORMAL ROUTINE SO I DON'T SKIP IMPORTANT STEPS. I WILL MOUNT A SMALL SIGN OVER THE PANEL THAT SAYS 'THE GEAR; STUPID!' AS A PERPETUAL REMINDER. I PLAN TO MAKE A SMALL BOX WITH SWITCHES AND A LIGHT FOR THE 3 OR 4 MOST CRITICAL LNDG ITEMS. THE LIGHT ONLY GOES ON WHEN ALL 4 SWITCHES ARE CLICKED AS A FINAL MECHANICAL REMINDER.