If your digging the HUD...I had the HUD added to my 2001 c5 z06 and it wasn't a big deal. Of course its better to buy a vehicle with it....(I think all corvettes after 2001 had the plug in the dash to accept the hud..)
As far as C6's go? there is a guy in conn. thats installing the full hud unit for 495 dollars parts included...
I know that GM has a different windshield for HUD equipped cars but with my c5 z that I added hud...I never swapped out the windshield and it was fine...
Sorry to go slightly off topic..
Good luck fixing the HUD unit.
2008 Black/blk C6 Z51 NPP M6
2008 Silver/blk CTS FE2 AWD 304hp