Are these the windows we spoke about a few months ago? If so, big design change. Are you asking about maximum size of each individual leaded panel so you can put in division bars? One of designers here could answer that question better than I. Are you asking if each glass blank in a panel has a standard size? Looks like a home. Are these going to be installed inside an insulated unit or mounted inside the structure behind an insulated unit?
Lets do some 1/2 inch bevels on 1/2 inch plate, letting the sun focus on the carpet and burn some holes. 8~() just kidding!