I am seriously considering an investment of the time, money and energy
required to build a video projector. With a bit of luck and patience it
seems quite possible to acquire the required parts for not much more
than £200.

There are several groups and websites dedicated to this kind of thing,
including:

http://www.lumenlab.com/
http://www.exclusiv-online.com/shop/index.php?main=main&lang=en&up=0
http://www.hommie.net/

Has anyone here attempted this?

Daniele
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Consideration fact
* With the robot the grudge which is possible it knocks from most
shouting distance.
* It is short accurate and it knocks.