This here is a comparison of my old mask to the frame of my new mask. As you can see, the new model will be smaller and more efficient! Not to mention I'm going to be building it much sturdier; the Mk I has held up despite abuse, but it's still plasticard glued together on its edges with superglue. That it hasn't fallen to pieces is something of a miracle.

The Mk II never made it into production. Pesky problems with converting it into Euclidean geometry.