I seem to find it very difficult to start writhing coherent instructions about how to make these bubbles and this project in general. However I did make some photos during the project so why not dump them all here and then make sense of them later so without further ado.

The Wired up Neopixels of the mask as well as the soft silicone tube connecting both cheeks to the main air supply.

Gleuing both halfs together with more silicone. Being careful not to get any on the cavity in the middle.

This is how the molds look when assembled. Note in this case lasercut acrylic is used as the front wall. You could also 3D print them or even use a piece of cardboard you cut to length

The original scaffold was lasercut from 3mm triplex (top) and 6mm (bot), these also work really well securing the halves when glueing them.

Shorting the needle tip makes it easier to insert and at the same lowers the risk of punturing the

Another version of the top part where it also has side slits that can be (and is) sewed onto fabric. This version can be generated from the openSCAD files directly (by putting render_sides as true). This is the nice thing of openSCAD it can be very easy to combine features from similar designs, in this case top and bottom scaffold.

Melting bolts (with a soldering iron) into just a little to tight 3D printed recesses makes for very sturdy connections.

The bottom scaffold being printed