First Stab at Detailing

This is my first attempt at detailing my Gould Street facade diagrid system. (Sorry the image is dark - I'm currently without a scanner)

I looked into some precedents of diagrid facades and found a Y-mullion but I am not sure if I am using it properly or understanding how it works completely. i imagine that the millions would more or less be vertical and it would be the glazing itself with the sealant that would create a diagrid shape based on triangulation.