How to build a Wii remote

I’m interested in monitoring relative position of an object using the Wii remote. However, the circuit board in the Wii remote is too large and I would like to make it smaller. Has anyone built a Wii remote using Arduino? I don’t need any of the gaming capabilities, just the basics (IR sensor, accelerometer, bluetooth, microcontroller, batteries, and sync).
Any help or advice would be really appreciated!!