RetroPi TV
thingiverse
Here's how to use a Nintendo Pi with a budget-friendly Chinese 3.5" LCD like those on Aliexpress - this one's an affordable flip-down monitor with two video inputs: http://www.aliexpress.com/item/New-3-5-flip-down-Car-LCD-Monitor-2ch-video-input-RearView-Camera-DVD-VCR-CCTV/642399875.html This was a eBay purchase but now it's not available anymore, the description is the same - I'll skip the details as it's really just hot-glue hacks. If you use the provided Sketchup file and modify it according to your specific needs.
With this file you will be able to print RetroPi TV with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on RetroPi TV.