well. I know this is a stale topic but what the hell.
It's only taken 7 years but dual projectors are almost a reality. well for me anyway.
HUD is the next project on my todo list. It is actually a replacement cluster that is fully digital, needs no modification of the dashboard or the bezel. will have navigation , parking sensors, lane assist, blind spot detection, birds eye view parking camera system with guides that move when the steering wheel is turned. It will be controlled using the factory steering wheel controls. I am also going to hijack the buttons on the onstar mirror, bluetooth and navigation audio will work through the factory system. Streaming audio from your favorite online service through the factory radio. and last but not least a transparent OLED HUD. no projector, no double image from reflection on the windshield.