I built my CCD many years ago. At the time it was much cheaper than buying an eqivalent one. Mine is a genesis CCD with a KAF0401E chip. This is the same as in an ST7E. The parts are no longer available for my camera but it was just a clone of the Audine camera made by a guy in the US.
I had a great time making it and the experience was well worth it. I am now very happy pulling electronic equipment to bits knowing I can put it back together again.
I don't know if the audine kits are still available but email them and see at
http://www.astrosurf.com/audine/English/index0.htm
The people that originally designed it are still very much active.