Hello 2Kamser,
if you have to double formers please never use waterbased glue! And take care for the grain of the cardboard. The good old UHU Flinke Flasche is well recommended. Sorry, your formers are a little bit in a waved constitution. Correct fitting with other parts could be a little adventure?!
I wish you all the best for your progress on this very nice old Wilhelmshavener ...
With lovely greetings
the Wilfried
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