You should off all had a look at it when you were at the meet at doncaster.
Afraid car is in the garage for a week maybe two so cant take pics.
My investigations found that there are various VW HUD Units but they needed the top of the dash to be cut and (based on a passat thread i read) needed a lot of space behind all the stuff that is already there so I decided against trying to retrofit an existing one. I further also read that on the Audi and some VW you needed different windscreen as the reflective part is in the glass.
Not saying any of this is true just at that point i went nah to much hassle.
What I have done is bought a cheap and cheerful phone holder / hud unit
I am running Torque Pro (which supports HUD) and some Navi Software that also supports HUD (Google dont yet) and so far its worked very well in both daylight and nightime, I also got a windscreen wrapper that you can hud against but not found the need to play with that yet.
For me it was about Oil, Water and Boost that I wanted for when I was on the track but cant do that with this setup as the phone is not tied down so not allowed (in case you roll the car you dont want a mobile phone flying around inside the car) so looking for old fationed guages.