L-Gaskets came in they are pretty much perfect.
I still don't have a glass tube for the chamber yet.
I attempted to use cheap glass 150 mm tube. I could not get it to cut on the saw without breaking in weird spots. When I scored it, it still refused to break on the score. I have given up on the idea of using this type of glass the wall was only a few millimeters thick anyway. I think I have to go for Corning Pyrex.
On the base plate, mill scale has to be removed so I dunked it in vinegar over night
I am hoping for a smooth enough surface so that I can get a good seal with the gaskets. I am withholding the requirement of many KF flanges as a size seems like it is way too small to load anything other than electrodes and single feedthoughs. It seems like a way better Idea to build a custom base plate for a particular application. So that is the path I will follow.