Add to watch is a great idea, so you can be under the table and altering things. I bought a few accelerometers with the plan to make a small cube that sits on top of the table, and shows the playfield situation on my phone, but time got away with me. So using the phone and watch (I am an Android user tho!) gives the same effect.

Need to make sure that phone back is lovely and flat tho! This project has loads of potentially! I really want to code it, but have little time, if anone out there fancies collaborating with me (and can code) I will work on it with you from an engineering point of view