Hi Jo,
have you done some testing/research on how you can get the camera working barebone? if so i'd be very interested to know how its done which i presume is the purpose of this thread.
I'm not sure if you need the LCD or any of the switches. just USB control should suffice other than temperature control which I'm not sure how you'd do in software.
The CDS site might help
just came across this page which shows mod of the 350D
http://www.centralds.net/cam/?p=1945
they talk about fitting an air tight chamber to the camera, cold finger to the sensor assemlby and so on. extremely informative.
I think they sell this as a kit.
http://www.centralds.net/cam/?cat=17
FWIW, JTW astronomy sell a kit for the 350D that you can fit yourself.
its about 199 euro and I think is a very good price.
http://www.jtwastronomy.com/products/icecube.php
Cheers
Alistair