A couple of photos from my car if someone wants to add some dimensions to them.
oooOOOHH Yeah that the measurements I want. See the size of that perspex screen, That could be the exact size of the after market HUD. Just imagine a new hood that covers the instrument panel then imaging the Bezel that's the bit with the perspex screen now just imagine you have no factory HUD sit them tempory on your dash and you remove that perspex and replace it with the aftermarket HUD this is 12 MM thick and have the size length and width roughly the same size as that perspex screen, Run the flat ribbon cable through the dash to the OBD Port, Set the HUD to auto start so when the OBD is active away it go's. Not worried yet about the double reflection as I have a few options on material to be used.
Can I ask you my Redline mate is it possible for you to measure that perspex screen length and the approx, width of it not worrying about the curve of the perspex.