maybe you could find good documentation for your project on his videos flying the Savannah-S. Sadly, Ilan died last february due to a bird strike while on approach in this very airplane. He was a well-respected sim developer, beloved husband, father and friend.
I wish you the best luck developing the Savannah-S for MSFS and I really hope you finish it the way you envision it. I’m a livery painter myself and I would gladly recreate Ilan’s plane for free download, as a simple tribute and token of admiration for his work.
His Youtube channel:
Savanna-s 4X-HPR flight in LLMG and Area A West (youtube.com)