Well, to answer my own question...
Yes, it works fine.
All but the magnetic switch (our magnetic sensor appears to be at the other end of the phone).
If you are building your own, relocate the magnets.
Otherwise, just tap the middle of the back of the thing with any handy magnet (you can use the one from the switch just fine.)
Amazing device, well more than $20 worth of fun.
DX.com can set you up for less than $10, if you are patient.
Last edited by docwebhead; 26th August 2014 at 02:25 PM.