Might be a dumb suggestion as I certainly don't prefess to know about the finer points on ethernet hardware, but... wouldn't it be possible to effectively mount an ethernet card in place of say the second hard-drive (assuming you could make an ethernet card small enough).
Then you'd just have the fun of finding somewhere on the caase to run the RJ45 socket to.
I don't know if this is possible, and knowing how much I hate "specials" I wouldn't blame you guys for not even considering the idea, but it could perhaps be done and marketed as the super-developer version or something like that (with a suitable price increase ;o)


- Given two theories.... pick the one that sounds funniest -