I know this isn't exactly what you're asking about, but this ended up being my budget-friendly option that still met the aesthetics desires of my customers...
For our PC release stations, we use Planar touchscreen monitors that have VESA screw holes in the back. The PC's are Dell 3050 micro form factor boxes, that can be ordered with a VESA mounting kit that fits onto the back of the touchscreen monitor. A USB card reader is attached to the monitor with 3M dual lock plastic velcro. And since we use the card swipe for logon, there is no need for a keyboard or mouse.
Other than the full complement of cables (power, network, USB, etc), which can be cleaned up with some proper cable management, it's a pretty clean looking setup.
I have a couple of spare setups of this configuration at my desk, with Pharos Station installed. If there is a problem with a release station, it's very simple to just change the 'Related Printers' for the spare station and do a swap of the station hardware. If it just the PC that's an issue, all I have to do is unplug the cables, slide the micro form factor computer out of the mounting bracket, and slide the spare in its place (and plug everything back in (which is easy because of the aforementioned 'proper cable management')).
Here are a couple of options for tablet mounting that may suit your needs.
Robert and Nathan,
Thanks for the info, appreciated.