I didn't realize there was continued interest in this thread, and that you were asking questions. My "subscription" to the thread must have been broken.
I wrote a tutorial last year to make the bluetooth option and saved it as a PDF, but it is was too large to upload and I lost patience at the time. Since there is some interest now, I have saved it to SlideShare. You may view it within Slideshare, if you want to download it you need to create a free Slideshare account. I'll email the PDF to you if you PM me your email address.
http://www.slideshare.net/Bublanski/diy-chrono-bluetooth-procedure-bt2-s
Here are a few pics, the finished product and the "guts":
To Boxerglocker, you're welcome, making the cable is a fun, easy project. The bluetooth option is fun too but as I said in my original post about it, it's not for the faint of heart and I'm not sure how I got it working in the end.