Thanks everyone!
I think I mistyped. The material I have is 1.1 ripstop. Not sil. So sorry for the misunderstanding...
As far as the shape issue goes, why would dealing with the coffin shape be so difficult compared to the rectangle? It seems to me it would be the same process of cutting out the fabric and insulation to match, then sewing everything together and putting in the drawstrings on the end...am I missing something?
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