I am still working on it, normally just do a pink / yellow line approach which is standard practice.
Block diagram is clunky but more of a memory jog for me. I haven't shown on/off switches, especially the powerbox as I may be able to get an extension and use standard connectors for it.
D-3100 series are pretty much what I was looking at, I can get them here. I did have a look at what Hacker offers but seems to be same product at a stupid price.
