The result is this Wii HDMI board, a "Wii Solo" if you will (since the form factor was heavily inspired by the Wii Dual). It runs on the standard Wii Shuriken V3 firmware and it should fit RVL-CPU-40, RVL-CPU-50, and RVL-CPU-60 motherboards. It should also fit RVK-CPU-01 and RVK-CPU-02 motherboards, but it doesn't have IR remote support implemented at this time so It's not really practical for those boards with no GameCube controller ports.
The advantage of this design is that it is low cost. Sourcing your parts from Digikey this board is around $35 to build and provides HDMI output which is what I think most people want from the Wii. It's not exactly an easy install since there's no fancy flex cable designed specifically for hooking up to the AVE-RVL chip, but it's not too hard to solder by hand with some 30AWG wire. Installation requires soldering 13 short wires from the AVE-RVL chip to the Wii HDMI board following the pinout in this guide on the GCVideo Github. I arranged the board layout so that the pads are in the correct order for soldering to the AVE-RVL chip so it's as simple to install as possible. You also need to solder wires connecting the following pads on the Wii motherboard to the Wii HDMI board:
"TP27"->"PAD"
"3.3V"->"3.3"
"5V"->"5V"
"GND"->"GND"
The main HDMI board and the HDMI hookup board with the Mini HDMI port are connected by a 20 Pin 0.5mm pitch Flat Flex Cable, the same kind that the GCDual uses for this purpose.
Here is an example of the board installed on an RVL-CPU-40 motherboard.
I've posted the boards on OshPark for anyone who wants to take a crack at it.
Wii HDMI v0.2 Main Board
Wii HDMI hookup board
The BOM for each board is in the OshPark descriptions.
Let me know what you guys think.