I did end up doing the cockpit from knowing how it was built, and figuring out what in the Benjemin build would not have been in original. However, I have shelved the project for now.
I was building it for a challenge- build a model you built as a kid, but with all your present skills. In addition to the cockpit I bought a resin Wasp engine, and intended to do rigging wires. But the kit is so out of scale, and misshapen that I am losing interest in it. I have had to whack off virtually all of cylinder heads to get the engine to fit in cowl, and the canopy is so misshapen that I will have to make a scratch canopy. No way I can finish it in time for the challenge contest, so it is going up on my shelf of doom.