After talking with Rana and Evan during the NSF review, I made some independent estimates of the thermal noise that
could come from the composite SRM which had a measured resonance frequency of 3.34KHz with a Q of 150. I get the same
thermal noise displacement spectra of the mirror surface as Evan in log 27488,27490,and 27490. Tend to favor the viscous case
as Peek is a thermoplastic as is Nylon which was measured to have a viscous spectrum. The model is a shear motion of Peek 8-32 screws 
clamping the 2 inch diameter 1 inch thick mirror into the metal carrier. The motion is a displacement of the mirror allowed by shearing
the 8-32 bolts in and out of the plane of the carrier - longitudinal modulation of the light beam. Thermo elastic damping is much too small
to explain the low Q. The time constant for thermal diffusion in the Peek screws is about 10 seconds. The thermo elastic delta is about 10^-2,
so that loss tangent phi varies as 1/f with a value of 5x 10^-8 at 3.4kHz and about 2 x 10-6 at 100Hz. My guess unfortunately is the
SRM is not responsible for the excess low frequency noise we are seeing. I think Evan and Rana had come to the same conclusion.