I'm being asked;
Do you have Gerber files? Or do you need to have them made for you?
Wtf? 
Gerber files are the 'output' files from the PCB design software. If you want, I can make these for you from the circuit diagrams here :http://www.hardwarekiller.bplaced.net/dvbtG.htm
However, you need to get permission from "Hardware Killer" first.
I would say if your going to hand over somebody else copyrighted material to a Professional PCB Manufacturer then you should almost certainly get there permission before doing so, even though the idea is based on a Group Effort convenience rather than Commercial Gains.
Some similar discussion here from about 5 years ago re Hardware Killer designs.
http://www.omegaowners.com/forum/index.php?topic=87458.0Might be worth getting in touch with the guy and asking for his thoughts, never know he may have already gone down a similar route with someone or know the whereabouts of existing PCB boards.
Having said all that, as Mark says its a pretty simple design, put the PCB Layout design to one side or redesign the layout with some changes, and all you effectively have is a load of Dil Relays switching inputs and outputs on some track, would be difficult to copyright that idea. As for the Sync IC, its probably taken or could be taken from a Manufacturer Data Sheet anyway.
Also if we / you / or whoever are looking at making custom made Circuit Boards, should we not be looking at other features more suited to the CID/ AV application in question, ie,
1, The Circuit PCB in question is a bit basic, its offering RGB input to the Sharp Panel (CID), ie Scart signal o/p from a Freeview Box, DVD Player, Game Console etc, is this what people want?, your not going to be able to plug a simple Reversing Camera or iPhone, Smart Phone into this input without further electronic trickery.
2. If we are looking at other features here, and I guessing the main one here would be plugging in your Mobile device for Music, Video, SatNav, Phone Calls screen display and various Cameras, then we need to be looking at CVBS input and possibly HDMI and VGA, whilst Im not suggesting that we design and add all these features to the PCB (although possible for some applications) we could think ahead and add additional switching and features into the PCB design rather than have a crows nest of switches and wiring behind the dash.
3, Whats the plan for Audio?, again any Audio switching, inputs / outputs, however its done, could again be integrated on the PCB design, which by the way wouldn't necessarily have to live inside the CID.