I feel your pain kp91, a restoration project back in the early 00s, all the windows in the building were custom made, (originally a captain's house (c) mid 1700s). They had massive intricate sills of the like I've never seen before or since. I had 1 window to restore, age, weather and probable impact damage (from what and when no one knew). 200+ yrs of paint held most of it together. The 2 local cos with the ability to reproduce the profile wanted a horrible amount of money for the 5'+ long piece and they would keep the knife set. When I was done I had cut, lamm'd and glued something like 4 to 5 different moldings to flat stock. If you didn't look too close the 2 1/2"+ thick sill would pass the untrained eye. I believe the profile was one of a kind and either completed with multiple planes or single planes with multiple knives set into it. It was impossible to match the profiles or dimensions with current trim. A couple yrs later I bought my own planer/moulder.
Never bite the hand that looks dirty!
The more you know the more you're worth