I've just done a bit of googling and this guy https://www.tablix.org/~avian/blog/articles/galaksija/ https://www.tablix.org/~avian/blog/articles/galaksija/ Ha

I've just done a bit of googling and this guy https://www.tablix.org/~avian/blog/articles/galaksija/ https://www.tablix.org/~avian/blog/articles/galaksija/ Has designed a replica system, with some minor mods to allow for newer easier-to-get logic chips, and better compatibility with newer Z80 CPUs. He offers up the whole design for download - so anyone should be able to build one. I've bookmarked it... I'm definitely interested in making one to add to my retro collection.