USB Switch (not hub; not KVM)

I need to constantly transfer files between two networks (corporate & analysis) that *cannot* be connected directly. Currently, we copy files to a USB flash drive on a machine on one network, then move the flash drive onto a machine on the other. Very tedious, especially as we do this at least once/hour or thereabouts...

Is there any reason I shouldn't build a 4PDT switch in a box - plug the flash drive into the box connected to the centre of the switch, wire USB plugs to the two outsides (poles), and stick one plug into the laptop and one into the corporate m/c?

Only one side is ever connected at a time, so there shouldn't be any problems with connecting two +V together, and since the cables would be short (<2m, .5 meter each side) the lack of termination shouldn't be a problem, should it?

I can build this for around NZ$20 (US$30-40, I think) (I can't believe a 4PDT switch is so expensive!), so it seems to be cheaper than buying a commercial one. Note that we can't use a hub since that would effectively connect the two networks together, which is a big no-no...
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