@ sphelps, thanks for the insight!
I hear you on the shrinking issues with silicone. I'm actually using the new "stretchmarks" as a sign of curing in the lower 1" seams. They're all over all the seams now after 3 weeks.
I'll paint the braces to fight corrosion. Although not perfect, the options are limited and these are a lot stronger than aluminum / plastic trim. Structurally speaking, the vertical braces help prevent bowing of the 1/2" glass and should help avoid any shearing. However, if it only serves to hide the visual imperfections in the seams, that's fine by me too
I am still adding a 1.5" stainless trim on the top as well to support the side braces.
All & all I'll sleep better with the braces on
I hope...