I initially started off using a nice little round touch button with a TTP223 chip.
But after accidentally pushing the soldering iron through the chip whilst setting the jumpers I bought some other TTP223 chips on little rectangular boards which are slightly easier to solder.
When ordering wood veneer from the internet, try and find a vendor that will send you the veneer with some packing so it doesn't arrive like this...
I used 5x Max7219 LED matrices for this project. During testing I had issues with LED rows dropping out or LEDs going off and on. It turned out that while daisy-chaining the LED matrices together, power drops after 4 matrices. I solved this by powering the first 3 via the initial cables, then adding a separate power line for the last 2.
...now I know why they are sold in packs of 4.