Project has started on November 26th.
So far I have a running prototype (Arduino UNO for the moment) where initial board setup is done though simple buttons.
Next steps are to replace some buttons with pots, to make it easier to select a LED in the matrix, hence make initial board setup step faster. The challenge here will be to check the code size will still fit in 1KB.
In addition, I am just starting to design a simple stripboard for the whole circuit (except battery holder).