Thanks for the reply, and sorry for my delay.
We used Javafoil to calculate the performance of the wings mostly, my job was to find the data on the wing-shapes and run them through Javafoil. Enter the data into the engine and flight test the ass off the planes and compare this to the most reliable RL testing data we can locate. So, whilst I did build, and tweak, we didn't need to manually calculate the wing performance. This made it rather more user friendly in open source (targetware). WarThunder was a similar process and we found JavaFoil gave quite good results, at least it took the human component away from the process. (Some builders like to 'tweak' parameters to much IMHO).
What I offer is not to be in the 'team' so much (life is busy), as to more be a source for some data on WW2 aircraft and their engines. I have a fair amount of tested data on IJ and Allied, particularly the Pacific theatre aircraft. All the usual stuff from the NACA testing, some independent Aussie and Brits tests also from our AWM, purchased engine documents from P&W, and books like the the Alison v1710, but also some harder to get IJ stuff I picked up along the way.
Give me a PM and a list of your data gaps and I'll see what I can dig up.
Regards
Steve