The wheat panel was a little bendy, and after garnering advise from fellow glassers, I put some rebar on the back side in two places. The rebar is 1/8" x 1/2" steel, coated in zinc, then tinned with lead solder. The first support went across horizontally in the center. The existing window in the church has a mullion in the same place, so the rebar will not have a significant visual impact. 
The second piece of rebar is at the bottom of the panel at the border. These long horizontal runs create a potential hinge, and with the weight of the panel, could potentially cause a problem. The rebar adds stability. I may go back and add rebar to the completed panels in the same location. 
Finally, the wheat and grape panel came off the work table, and I began setting up for the Omega panel. It took most of today to make the template, place the pattern in the metal grid and cut out the border.
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