Robotron Z1013 - new target
This was a quite popular machine in the eastern Germany.
It was still widely used when the fall of the Berlin wall happened and it seems that the sudden accessibility to more hardware resources permitted the hobbyists a late improvement/personalization of such systems.
The supported variant is a Z1013 with video circuitry and RAM expansion: since a quite extensive software base seems to have been developed for such configuration, I think it is a good choice.
At the moment we have lo-rez graphics, ANSI VT option (no attributes nor sound) and packaging for the ".Z80" format used on the existing emulator and audio converters.
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