Hi Stephen,
I found the Pegasus gear legs, and the doors are molded to the legs themselves. They feel a little thick, but comparing them as best I can to the doors on my completed Airfix Hurricane, they seem like the same profile. I'm happy to send them to you if you want to PM me your address.
I'm assuming you have the other legs for in-flight for the Airfix one? If not, I can find those and send them, too, if you want to try to modify them.
-BD-