Just signed up on the Arduino forums just to comment on this project! 8)
This is an awesome project, I've taken an interest in delta robots in the recent few months after seeing a delta cnc mill and this is a great example of how to get into a delta design with minimal costs. Congrats on the great work, I hope the lack of response on here hasn't put you off sharing your projects.
Do you think you could post a copy of the code? I'd be interested to see how it works and how you've implemented it all. If not, could you PM me with a copy, I'd like to learn more.