I made a giant 16 foot long sign the other day:

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It's backed with LEDs that I got from Hafele. It's got a touch on/off/dimmer switch hidden on the back as well. This was it on during the day in full sunlight. It was pretty dramatic at the party it was used at overnight.

I cut this on my ShopBot using PVC for the front letters, MDO for the back panel, and scrap MDO for spacers. The letters and the spacers had dowel holes in them for perfect alignment:

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The toolpathing was all done with www.getfabber.com. I worked with the client on the SketchUp model you see below. Then when I got to the shop I just selected the parts I wanted to cut. After putting material on the machine I was able to go from 3D model to toolpathing in just a few seconds.

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The full gallery is here. Let me know if you have any questions!