Does anyone out there know how to make a canopy from scratch? Perhaps there have been articles in some of the modelling magazines. Does anyone have a reference?

My specific problem is that I am in the final building stages of a 120 inch wing span Schweitzer 1-26 and need a canopy. So far I haven't been able to find one that is large enough. If I cannot find a canopy that will work, I will have to make one myself. The alternative is to make it from a hollowed balsa block and then paint it.