Projectors are still pretty expensive. Also auxiliary services are necessary not just cheap projector replacement lamps. But with little technical skill can combine standard components to a makeshift projector, some with astonishing results. Here links to relevant building instructions.

Here you will find Schematic Circuit Diagram for DIY and further information on Beamer
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Different approaches	www.widescreenathome.de/html/frameset.html
Extensive site about DIY Projector	www.diybeamer.ch/portal/