I just saw this project and immediately got upset. Why start from the ground up and build something that already exists, works, and is on iPad!
Instead of re-inventing the wheel, why not band all of our fantastic brains together and help them improve and better standardize that app? A laptop running filemaker on set is about as awful an idea as I can think of, can we please offer our camera crew brethren a solution that makes their lives easier not harder? The next iteration of this app will allow data sharing between devices, so a VFX supe, data wranglers, script supe, and camera assistants can all work together to fill in data about what is going on moment by moment.
We use this app extensively, and it works incredibly well.
Please, refocus this effort onto something that exists to make it better!