My prototype control board is now completely soldered up now.
I still need to do some testing, but I have powered it all up and it didn't set on fire, so I'm hoping all is well.
The main improvement is that the TLC59040s are fully soldered up.
I'm going to test all the various functions over the next month and will also be purchasing the various components I need for my LED drivers, relay enclosure and relay control board.
Here are a few pictures of the control board so far...