got some T-connectors and connected all four springs to the lab air supply. The pressure of 32PSI is barely enough to float the chamber. The side with the horizontal extra flange is almost too heavy to float, but it's OK. The other side is much better. But overall the chamber is pretty good leveled. Tara re-aligned the laser to both cavities and the beam height is ~6.5in as designed.

we measured the TF from the table to the vacuum chamber. Sensor is attached to the top of the ion pump in the center (left picture), the other one on the aluminum block next to the chamber (see picture). Resonance frequency is at 5.19Hz and has a transmissibility of ~10. Both numbers are slightly higher than expected from the datasheet.