This Apple IIe mini is completely self contained and has a battery life of about 10 hours give or take. I haven't actually tested it, so I'm guessing based on the stated life of the battery and the amount of currrent draw observed during testing.
The C.H.I.P. can use 3.3V to 5V power, however the LCD TFT screen requires 6V to 12V. I solved this by using a 12V drone/RC battery and passed it through a cheap 5V buck converter to power the C.H.I.P. I created a very simple PCB to accomplish this. You do not need the PCB to complete this build, I created one just to keep things a bit tidy.
You can of course use a super cheap linear regular like an LM317 to do the same job, but the $5 buck converter is much more efficient and will extend the battery life.
A stock C.H.I.P is all you need, I could not get the emulator to run in headless mode, so you will need the standard firmware and then configure the emulator to auto run in the KDE desktop.
I used the excellent 3D models from Thingiverse of a user named option8 and printed them on my Zortrax M200 pinter at 0.19mm/Medium infill. The original models are meant for a Raspberry Pi powered via USB, so I modified the base a bit for this self contained model.
I drilled a hole through the top of the enclosure into the monitor to run the wires for the monitor power, power switch, and video signals into the monitor.
Unfortunately the composite video signal from the C.H.I.P. is not exposed on the pin headers, so I was forced to hack it in. If you are able to find a small enough right angle 3.5mm to RCA video cable that works go for it. I was not.
To hack in the video signal, simply attach a wire from the video signal on the C.H.I.P. PCB. I have highlighted the correct pin here: [Video Pin](./BuildImages/VideoPin.png)
Connect the video GND to any available ground, I soldered it directly to the top of the 3.5mm connector on the C.H.I.P.