After conversations with Alastair and Steve, I have come up with the following design for the new (AR, wedged) viewports for the gyro vacuum system. I turns out that we already---for some time---have the optics (W2-LW-1-C-1064-0) and CF blanks that we need.
So, all we need to do is:
A glance at the diagram below will make the above make sense.
I am going to talk to Mike Gerfen on Monday to see what he thinks.
The plastic brace-delrin on the top has to function on the top: 1, hold the window in place at atm 2, keep dust-dirt out.
The window should sit on a thin teflon gaskit on the vacuum side