Hey E46ers. I see everyone with these beautiful setups with the custom bezels etc., but I'm curious. Now that yo removed the factory head unit, how do you get to use;

1. Blue tooth phone interface
2. BMW Assist
3. Steering Wheel buttons

I've become quite attached to these features and it appears they all depend on leaving the factory head unit installed. Is this true? Can I circumvent this issue without a degree in electronics? The idea behind having a well constructed carputer/screen setup is to make it appear oem. To do this, it would seem one might like to integrate some of the cool BMW features they paid for. What do you think?