Is there a link to how the leaded windows were done? *edit* Nevermind, I just found it.
Have you considered using those little plastic bead things that you can get in craft stores to make stained glass images with children?
The ones you arrange in al-foil or something how you like, and then leave in the oven for a while.
What are you planning for the front balcony capping and on the rear...rotunda? The green seems like it's still being worked on.