Using a redragon keyboard their usb connects with a 5 pin jst, easy mod to hook up to a pi.
The more challenging part was learning my screen preferred PAL to NTSC. I have the display forced through my added connector on my pi0w, I set up just the basic raspian to run tilde as my console and automatically load into it full screen.
The main reason I chose tilde, is that I can roll it up with a key plus the options to control its window size was pivital in figuring out my 'real' screen ratio.
I just happened to have one laying around and it fit my budget . It was fun setting up and the 'retroness' of svideo was something I thought would add to the look of the cyberdeck. My goal for the screen is as a primary terminal, the real feat is when I can use it to control my smart tv.
For now just one step at a time; I'm currently designing a power switch to allow use while plugged in and charging the battery. I picked up a 15000 MaH pack from radio shack at ½ price and plan to use that as the primary power source.
The screen tales 9v and I can feed it with the pack, as the screen has a 9v out (for a second screen) I plan to use that to power the pi0w. It will be quite a hokey daisy chain.