The Holography Workshop at
Crash Space ended up working well. All participants made working holograms. Some of the ones made early in the night had some zebra stripes that indicated a bit of vibration, but as the night went on and fewer other folks were in the space, the zebra stripes went away.
Next time I believe I am going to purchase a granite tile and put some
sorbothane washers underneath to further isolate vibration.
Here are some pix:
(Photo credits: Birgit Bachler, Tyson Macdonald)