I've been working in my spare time on a "portable" Gamecube just for the fun of it.. of course this will not be even remotely as elegant as the Gamecube Fusion portable, but it is nice to mess around with Gamecube hardware.
Planned final specs:
9" DVD player 16:9 screen w/ Brightness adjust
Stereo Speakers w/ Volume adjust
Dual Stereo Headphone out
A/V Out
Gamecube DOL-001
2x Memory card ports
1 Controller port
Wiikey Fusion
Progress so far:
I've managed to get it working so far to the point that the bios will boot up and I can navigate around and use the memory cards/etc. It's quite rough in its current state and very work-in-progress. I've mangled a standard heatsink and have the stock fan for case ventilation but I will replace the stock heatsink with a trimmed 1cm heatsink (thanks Ashen!) + EeePc fan (2 fans, I know :p). At the moment it'll heat up too much to play it for more than 5 mins, so I'm waiting for the new fan and heat sink to arrive

To complete it I want to install a Wiikey Fusion somewhere and tidy up the casing (at the moment the screen is just taped down on top of the case.. so I'll put some border around the screen, and then finally, some plastic/vinyl decal around the back/side of the case where all the inputs/outputs are to show what does what as well as to mask the roughness of my novice dremel'ing :p
Credits:
Credits go out to everyone who has made/talked about portable Gamecubes, without them I wouldn't have been motivated to get this so far. Particularly: Ashen, zenloc, etc, you know who you are

Onto the pics!
Up and running:

Power LED:

Controller port and memory card ports:

Video out, dual head phone out, volume and brightness as well as the power connector:

Another shot:

Inside (screen on the right)

Controller port, LED and (temporary) heatsink:

Screen PCB:

All in one shot:

More pics to come when I finish this thing and get cooling sorted out!