thanks for your advices. this was also the point what I was afraid of
the Idea was to cut the raw wood not exactly in the middle. the back bigger part of the wood would be the constuct part and the front being outside of the buildig would be smaller thiner ad would be only a screwed part that you could screwed out and take the window anytime out.
but exactly there s the second point thet you mention- the wood is working. I would use larch wood which is good but it is workig. you right. recentangle wood is ofcourse the best classical way. but somehow the look of raw wood is for me much more exciting
and i was wondring if there would be any way to use it in a raw way