This is a standalone console I've put together. It prints in three parts but is easily expandable.
The parts are simple:
Raspberry Pi 3 B+: https://www.adafruit.com/product/3775
Stereo Speaker bonnet: https://www.adafruit.com/product/3346
7" LCD HDMI screen: http://a.co/d/aF1gxBp (this is good because it runs at 5V off USB)
Plus power adapter + SD card for the Raspi
M3x5 - 12
M3x18 - 4
M2.5x10 - 4 (For mounting Raspi)
M2.5 nuts - 8 (For mounting Raspi)
I am running Recalbox on this exclusively set up to run N64 games - but you can do whatever you want with it! Everything is set up default, nothing special required. I had to trim a bit of the HDMI cable to make the speaker fit and a 180 degree USB would work better - but other than that it's just plug and play!
The plan is to eventually turn this into a fully handheld and portable N64 system. Stay tuned for that.