Hi Richard,
Some time back, I stumbled upon a site out of Russia that has some pretty good three-views. I just checked and it has views of the P-39, several variants of the Mustang and of the Corsair. You can get to it by entering
www.airwar.ru/other/draw_fw.html.
Once there, click on the first underlined area below "404". Being in Cyrilic, it's kinda tough to describe. Sorry. After you've moved to the next page, click on the British flag to get to the English language. Then click the "Drawings" icon. The next screen will have a link to "WWII Fighters". This is where you'll find your aircraft in three-views.
Hope this helps.
Al