All good! Sounds like a cool project! :)
I am always more then happy for people to modify and recycle stuff from these games. Its all part of the fun...
Viewing post in RANBLE (ZX Spectrum Next) comments
Cool man... many thanks. Hoping my effort will inspire one or to give it a go. I think a great starting place for Z80 is to follow something like you've created and use basic techniques within z80, and reference other Z80 sample code out, bringing the two together certainly helping me to get my head around the next.