Update. (endless thanks for all your patience!)
The impact standard requires testing the frame with the lenses. (Answering the question: Does flaming compromise a lens?) A properly fitting mask means that the frame (skirt) is properly sealed. This was no small feat!! I tried a bunch of things and had an 'aha' moment on one of my daily walks. OK, so nobody saw me fitting a dive mask to an endless number of stones in the local stream. I'm sure that I got away with it as I'm not currently in a formfitting white suit with arms that buckle in the back...
Anyway, huge progress. The head stage (rock) bolts to a 50# plate and allows for 3-point leveling. I can meet (easily exceed) the combined mass standard and the deflection standard for a Z87.1-2015 head stage.
I have the guide tube but found out that cobbling things together just to get it done makes everything really 'iffy'. Back to the steelyard on Monday to make a tripod for the guide tube and it is a go.
View attachment 513542
LOL, a good likeness