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Maybe I should mention it here too. If anyone has a fake one and can consider lending it to me for a while, I'd be very happy. I wish to do a teardown of one and document various aspects of the hardware and CPU behavior.

Ok, so a couple of comments.
If this is primarily intended for mGB, what do you need the mode buttons/LEDs for? I'm assuming there are LEDs under the cover, or you're planning to add that. Actually, those are the same LEDs used for MIDI traffic indication, but the labeling seems a bit off, again, depending on the intention.
If this is not just intended for mGB, the cartridge should probably be more easily switchable.

MIDI has support for multiple channels, so theoretically the two mGB at lest should be able to share one MIDI cable. However, as far as I remember, mGB has some problems with receiving data on multiple MIDI channels, where it will crash and/or corrupt the save memory. But in theory, that could get rid of one of the physical MIDI jacks.

Currently, you obviously have no control over the Gameboy's buttons. I have an idea for how to wire up an NES controller for this purpose. (Basically, some 74hcxx  logic: a parallel to serial logic, a 555 timer and a decade counter, or similar to generate some pulses needed for the NES controller to return data and a couple of transistors to emulate the buttons.)

If you're using an EMS 64 Mbit cartridge, you can actually support multiple ROMs on one cartridge with a bootloader program.

I don't think there is a mass-market for this kind of project, but I'm sure there are a couple of rich people in this world who pay a pretty big sum of money for a unique piece like this. If that turns out to be the case, I could help you with customizing the two last things I mentioned for you. I'm sure there are a couple of thing NeX could help with as well. (For example, video out for the 'boys.)

How is the internal construction? Could it survive a free fall from 1.5 m? (5 ft. in backwards length units.) I think rack-mounted units are always assumed to be pretty rugged.

Ok, I've made an exception this one time. I thought the rules you accept clearly specified that names are final, but clearly not. (This was the consensus when we created this site.) I've updated the sign-up rules so there should be no confusion in the future.

What you're suggesting won't be possible with a standard cable because it doesn't carry the +5V pin. You could modify a link cable on both sides so it carries +5V power from one side to the other. Or you could use a standard link cable and provide power to the ArduinoBoy from somwhere else, liek a battery, say.

Maybe this is exactly not what you're looking for but a pretty cool tune on a purely technical level (too.)

http://soundcloud.com/ronny-engmann/atomic-pretzel-c64

Seems very DIY atm: http://www.retrode.org/plug-in-adapters/#n64gba
Plus, I'd imagine support for various flash carts would shaky. (By which I mean non-existent.)

I'm almost 100% sure that's not a serial port but a parallel port. And USB parallel port adapters don't work with these devices. Vista 64-bit (and maybe even 32-bit) will enforce driver signatures, so you probably won't be able to use the giveio.sys driver or similar. (There's also userport.sys is generally considered better for XP.)

One of the many things I should do, but probably never will, is to make a bootable USB distribution based on Windows 98, 2000 or XP which contains various Gameboy tools and similar you can use for these things without installing a different OS.