Just a follow up, for anyone else interested in the windscreen or other fiberglass pieces for P-Cars.
I found the part at
http://www.americaninternationalracing.com...46&page=112 and after some discussion with John @ American International Racing I decided to pull the trigger on a couple pieces. The customer service and engagement with John has been great and he's offering a discount in exchange for a very modest donation to charity and I still saved money. Well worth doing.
Should get the pieces in a couple weeks, I'll update when they arrive.
http://www.americaninternationalracing.com...246&page=29