There’s a larch plantation behind where I live. They had to cut it down due to disease.
It is the traditional wood for making farm gates. The guy with the plantation sold several miles of the larch for railings. Doesn’t need finishing with anything as naturally very oily.
In days of yore, Larch was also the preferred timber for boat making as it is straight grained and mainly free of knots. This makes me think it is the perfect wood for your application.
My only warning is that it is a b*gger for splitting down the grain, so treat it with care. I was given some beautifully grained larch pieces for guitar making, but the router didn’t like it at all.
here’s a little piece I used.
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