Hi,
There are several wood workers that can make wood for the 50 Plymouth Woody.
However, keep in mind , as stated above, there are no "kits" available - unlike a Ford of the same year.
So, if a new wood body needs to be fabricated it would basically be done specifically for your car.
Also, the wood, once made would need to be "fitted" and adjusted to the car.
It is a very expensive process and I would venture to say may cost in the ballpark of $25,000-$30,000 for an entirely new wood body - unless you are doing some of it yourself.
I have followed some threads here and on other Forums of members doing the wood themselves.
I tip my hat to them as to the beautiful work they are doing - and for dedicating the extensive amount of time and patience to see the project through
Also, if, as you say, there is one car that has a lot of the wood that can make it "easier"/ "simpler" for you to use the old wood as a pattern for reproduction.
Good luck if you decide to "dive into" the project.
Post some pictures, too.