The guys at Scene Double are very helpful - we use a lot of their extenders for sending SVGA a long way and we had to make up a replacement 25 pin (D) - 15 pin (HD) cable. I emailed Ray;
I wondered if you could let us have the pinouts so I can quickly knock them up a new cable.
He replied with suitable engineering forthrightness!
I would not advise knocking up cables with mini coax.