Experimenting on a bread-board is very quick and works well. It is not very stable though, cables come loose too easily. I decided to build a stable HW-platform for my SW-development so I brought out the soldering iron.
The result is compact and stable, but I really don't like to mess with all the wire-cutting and soldering. Next version of the build, with external SRAM and bank registers, will be built on a professionally manufactured PCB.
Missing from this build is the connector to the screen, which will be a (small) build for another day.