I have Douglas Fir paneled entry (exterior) door that has rot on the
lower center stile. Some wood worm holes on the middle center stile and
what appears to a new bottom rail (10 inches high) made out of a some
sort of yellow pine. The door is curved and getting a replacement is
going to be very hard. So I am left in the position of having to repair
it. I am looking for suggestions on how to stop the rot and wondering
if I can fill the damage with something so i don't have to replace the
center stile. Also what would be a good filler for the woodworm holes.
The door will be repainted when I am done.

This post was cross-posted to alt.home.repair.

Thanks in advance.