7 inch display. You can use one from a portable dvd player but they are usually low quality so I recommend this one: http://www.adafruit.com/products/1726 It is very high quality and because the biconvex lenses zoom into the display you can really see the pixels in low quality ones.
Laser cutter, I used the one at my local makerspace.
Computer to flash the raspberry pi or you can buy a card with noobs pre-installed.
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Most important bit is how do you configure the raspberry pi to display a split screen with warping for the lenses?