It's a bit smaller than I expected, having seem some photos online of folks that have had theirs apart for various upgrades and projects, I had the impression that it would have been slightly larger. Looks like it should mount under my desk without problems.
I'm not planning on using the wireless capabilities at this point, as I have an AirPort base station, but may in the future. If I do that, I'll need to add an external antenna, since being under my desk won't give the thing a whole lot of range. From looking at the disassembly others have done, this will involve desoldering the existing antenna cable, and adding a new cable/connector to the outside of the router. Shouldn't be that hard to do.