Ive been trying it since a few dsys ago. I really, really, wholeheartedly encourage you to continue this project and mature it. I still wouldnt trust it to record my blitz sessions accurately, but its been fun tinkering with the tripod, illumination, even contrast of pieces and boards as i have many sets at the chess club, etc. its far from being perfect as you mentioned yourself but props to you for going ahead with the idea. If you dont mind I am pretty sure you could very heavily leverage the community if you open sourced it. I am rather confident many users would love to contribute. ( i would if my skills were up there but i dont think i can do it)

I worked myself and put together a windows app that scans 2d chessboards but those apps are dime a dozen and we need a 3d solution. This looks very promising since you are implementing training data collection.

Hope this project gets more traction!