I too am an HG10 owner and have been looking for ways to supplement production value with this consumer grade camera - somehow. This DOF contraption sounds exactly like what I'm looking for! I hope to see an update with the footage and pictures of your device.

PS - I just recently found out that the HG10 footage when shooting on 24p mode needs to converted through frame pulldown (using a program called JES Deinterlacer) . . . . in the same process used to convert Canon HV20 24p footage.
Instructions at this forum: http://hv20.com/showthread.php?t=243

Hopefully this helps someone - cause it sure took me forever to figure out why the 24p footage always captured as 29.97 frame rate!!!