Surface from 3 curves

 From:  renklint
11439.1 
Hi everyone,

I have these 3 curves in blue that I'd like to use to create a surface.
But the best I've come up with is splitting them so I can do some lofts and then add a planar triangular surface on top.
The lofts look great, but I would like to avoid the planar surface on top.
Any suggestions?


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