what plans you have for the new board
Well, I made the LED blink!
Normally, I'm not very into "retro" computer technology (nothing older than a PIC, anyway), but this design was clever and cheap enough to run with (well, perhaps not THAT cheap, after spending $30 on PCBs, but... I can make (have made) more than one! At my age, I have a bunch of friends who were like "My first job was programming a Z80..."; maybe I'll make them into gifts!)
In theory, a Z80 system like this is particularly interesting because it is so "RAM-rich" compared to most microcontrollers. Having 32k of flash and 2k of RAM is much different than having 34k (or more) of true vonNeuman RAM...