Based on testing information from Niko Massaly (it works!), I made a few modifications: the anesthesia vaccuum line now comes out of the side of the mask, the platform is a bit larger, and the ear bars are a bit pointier.  The base mounting holes are now positioned to mount onto an optical breadboard with 1/4"-20 Taps like this one, to give it a more stable base:

https://www.thorlabs.com/thorproduct.cfm?partnumber=MB612F