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1Step 1
Source the parts. I used Amazon for perfboard and the LCD, and Adafruit for everything else.
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2Step 2
Design the 2D drawings. Inkscape is your friend.
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3Step 3
Extrude into 3D. OpenSCAD is your friend-as well as [dnewman]'s Inkscape->OpenSCAD script.
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4Step 4
Cut the perfboard to size.
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5Step 5
Drill holes in the perfboard and solder the tact switches/analog stick(s).
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6Step 6
Thin out the Pi by removing the tall parts (USB jacks, Ethernet, 40 pin header).
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7Step 7
Glue on a single USB jack where the Ethernet port was, facing the same way as the HDMI port.
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8Step 8
Add a wire off of the 3.5mm jack to output composite video. (Use a multimeter and a known working AV cable to figure out which pin it is.)
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9Step 9
Open up the screen and throw out all but the LCD and its driver board.
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10Step 10
Find the +5v out from the driver board's onboard regulator. Solder a wire here to bypass the regulator and instead use the +5v from the PowerBoost 500c.
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