And indeed I did!
By carefully studying (to change the habits of a lifetime...) 3-view drawings, I realized that there is a very slight dihedral, maybe not more than 1-2 degrees.:
But it's there! And it is noticeable in Otter pics, if you look close enough:
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1. Dihedral is noticeable in this pic
I had my wings set at zero dihedral, so I bravely detached the supporting struts, "loosened" the wing to fuselage bond by applying liquid cement, reset the wings at a slight dihedral, reglue the struts at their correct position, and place the Otter on one of my improvised "jigs" for a two step angle setting process...
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1. Step 1: initial setting, to have a positive glue attachment
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1. Step 2: Final setting, I go for it!!
Now all is drying, hopefully to a more correct dihedral. Thanks Allan, @kalamazoo for the triggering!
The top wing fillets, underwing hinges and landing gear struts were beforehand glued in place:
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1. This will be a liquefied styrene triumph....
Cheers, DH100GB!