I had a go at building Darius' Standards Converter and can highly recommend it.
I have made a few changes to Darius' design in an attempt to cut down on component count, namely:
Using 74HCT4046 PLL instead of Darius' discrete design. Using synchronous logic and sharing the PLL prescaling functions with the clock and synch dividers. Using a 74HCT4053 analoque switch instead of the difficult to find 7451. I had hoped to use the third switch in the pack for the CCD output switching but Darius' original discrete design gives a better crosstalk perfomance.
If anyone requires more details then I'm happy to publish them.
The converter can be seen at
http://www.scottpeter.pwp.blueyonder.co.uk/AP4.jpg
and a couple of images taken from my HMV901 can be seen at
http://www.scottpeter.pwp.blueyonder.co.uk/AP7.jpg
and
http://www.scottpeter.pwp.blueyonder.co.uk/AP10.jpg
Peter.