Hello; I've had a project on my desk for some months now, where the idea was to modify the Gameboy cartridge player for the Gamecube, remove the board and replace it with a Raspberry Pi with RetroPie. This way, not only can the bottom attachment display Gameboy cartridges, it can also emulate NES, SNES, N64, ect with the RetroPie software. Some Notes: 1. I am trying to keep the original dimensions of the height and widths of the Gameboy player as much as I can. The inside structures, front wall / cartridge slot, and screw posts of the GBA player have been removed with a Dremel, only the 4 posts for the gamebit screws remain. 2. The Pi is a Model 3 B+ with required software installed onto it. 3. I have modeled and printed a custom mount to glue into the clean shell of the attachment, and a front panel will be modeled with slots for USB plugs, extending from where the Pi sits. An SD card slot will also be modeled into the front surface so everything is accessible from the front. 4. The custom printed mount also has it's own wall with holes for the HDMI, audio and micro USB ports. Therefore, a small section of the back wall on the attachment will be cut out later. So I currently have access to the Micro USB for power and I can just finish it nice and simple; however, I like going above and beyond. I'm sure most of you can understand that. Is there a way for me to power the Raspberry Pi from the Gamecube using a voltage step-down board? I would need to know where to pull a charge and ground from somewhere on the Gamecube (or the part of the GBA player's board) and run that to the step-down board, dropping it to 5v, then from the step-down board to the Pi. That being said, should it be possible and work, I also don't want the Pi running each time the Gamecube is powered on to play Gamecube. Can I take my project's circuit further and incorporate a switch to turn on the Pi when I want, and if so, how would I do that? I can post pictures of what I have so far upon request. I'm also trying to figure out a way to get my USB extension cables to fit nicely in the case. It's a close fit, but it can work. All help is much appreciated!