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It is based on the Wii Omega trim, which is a cut down original Wii motherboard removing all the non essentials.

Some components in this build are reconnected to the board using a flexible PCB connector, but the core is just a cut down OEM Wii board.

Check out the short stack GitHub for an overview of how a previous mod was done. Literally chopping up the motherboard to the bare minimum then adding back things with daughterboards https://github.com/loopj/short-stack

There's a long history of people taking an original Wii motherboard and physically trimming the PCB with rotary tools (or a hacksaw) to put them in smaller enclosures, usually to make them portable.