Hi! I've just placed an order at PCBWay to fabricate the PCBs. Here are the final drawings:

1 - A panel with enough modules and submodules to build a complete system: 3 sensor submodules, 2 servo controllers, 3 power supplies, 8 MCU modules. I ordered 10 panels like this:

2 - The backbone where the modules, with attached submodules, will be plugged. There is also a place to attach a RN131G wifi radio to it:

3 - A support to hold the RN131g and plug it to the backbone:

The total production cost was 318 USD. I have already ordered other PCBs from PCBWay and they did a very good work, so I used their services again:

If you believe in this project and wish to help, please send me a $1 USD donation to help paying for these PCBs. All the project files are available on the repo for public use. My PayPal address is enhering@gmail.com

I'll keep posting the project progress here. Thanks again for your support and comments!