My husband Eric measured and cut 3/8" zinc "U" channel for each side. (I appreciate all his experience working with aircraft sheet metal). Note that Eric put the window back in the jig to make sure that the metal frame stays close against the glass while I soldered it onto the perimeter of the piece. Shown is the back of the window, where I soldered the lead lines directly to the frame to give the window strength and stability. (Click on any photo to enlarge).
black patina to the entire window, front and back, with a metal craft brush. Simply paint the chemical directly onto all the lead lines, let it set and then rinse off with cool water and pat dry. I used a specialized black patina for the zinc frame, same process.
stained glass finishing compound. Its a carnauba wax, similar to what is used on cars, only lighter.
I signed the piece earlier in the process, before I completed the copper foiling. Its in the bottom right and barely noticeable. Here's my etching tool, signature and date which goes on all my windows.
And here it is! (Click on image to enlarge)