Jimmy has the answer, score the door first. Also make sure you don't
have any burrs on the bottom of you skill saw table or use cardboard
or tape under it to be safe. You don't want to scratch your door with
the skill saw.
Scoring with a knife would help.
I'd also try to figure out if there is enough wood there to take a 1/2" off
without destroying the door. I recall trimming a wood paneled storm door as
a kid only to find that the bottom of the tennons then showed. Apparently
the door had been trimmed before or the tennons were quite wide. ;~)
They would show after cutting but that wasn't the problem. The problem is
that if you cut the bottom side off the mortise there isn't anything to
support and hold the bottom rail and panels in place... though the mortise
and tennon is nailed (not glued) everything eventually falls due to gravity.
This month's (January 2007) Fine Home Bouilding magazine has a short
how-to on trimming doors. I glanced at it. There was a picture of
making measurments while the door is still hung, there was tape
involved in the cutting and I think I saw a scoring knife......
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