The "computer" he's trying to build uses a very specific bit-to-pixel mapped output. It would need the operating system rewriting to use any other form of display.you might want to look at this: https://archive.org/download/tvtcb_doc/tvtcb.pdf this was a display and keyboard made with TTL chips. from what i can tell from your posts that's pretty close to what you want. basically it's a video terminal that you can use to "talk" with the CPU hardware.
The only practical physical version recreation of the original HDL emulator I can think of is by using a dual-port RAM with the output side driven from counters using timing taken from a video sync generator circuit.
There are various more practical designs available for DIY machines, that can be built with completely off the shelf parts & no great hassle, as there will be with this.. Though I've got to admit it would be quite impressive to see it realised entirely in physical logic!