Sasha, checkout www.sommerfeldtools.com, they have a flexible plastic
strip exactly for this application. They also have a bit set for making
mullions. EXCELLENT!!! setup. If you go with mullion (divided panels)
be careful with glue squeezout. They sell a drip glue with aeresol
spray to activate and this leaves ZERO mess. They also have DVD.
http://www.sommerfeldtools.com/products.asp?ID (pic shows "panel
glass retainer" in action).
I am NOT related at all, I just appreciate the time they have saved me.