If I wanted to make my own Avalon Asic miner what exactly would I need?

I opened up my miner out of curiosity and found out that I can put in two more Avalon 23gh modules in there. I am unsure how exactly I would go about installing them into my system, but then I thought about making my own with Avalon parts.

it looks like a Raspberry Pi is in there but I am unsure about the model and it has another mobo in there that I am unsure about. It is connected to the power supply and that motherboard is connected to the Raspberry Pi. I have never built a PC before but I know how is it similar?

Building a miner looks like it will be fun. Anybody with experience of the Avalon rigs know how to do it?

TL;DR

What would I need to make my own Asic miner?
If I bought two modules can I just plug it in my Avalon and the system would just recognize and add the extra gh?