Received my NABU today, and after some initial checks I tried replacing the Z80 with my MCLZ8. Seems to work fine – and fits in the machine perfectly!

Some ideas about what to do next:
– The MCLZ8 emulates the Z80 but can also emulate the BIOS ROM so I could try a number of the old and new ones out there.
– It might be simple to intercept and swap address ranges to run MSX cartridge ROMs on the NABU. 
– Can create some drivers for the video, sound, and keyboard to allow C code to be run the NABU using the 800 Mhz Teensy 4.1. Sort of like a “NABU Shield” for the Teensy.