Hello, Peter made an awesome video (4k quality!) demonstrating the assembly of the following modules
Euroceiver (line driver receiver in the rack), power distribution
A1 Expander (AOUT based on MAX5500)
D1 Expander (DOUTX1 for gates plus protection)
D2/D3 Expanders (likewise for clocks and triggers)
Feel free to use this thread for any discussion or troubleshooting. Have fun building your modules!