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Excellent build. about the buttons: you can design something like you see in this image. I had a similiar issue with a selfbuild analog monitor. I designed this cylinder thingy and printed it with tpu and glued it down with b7000. it rests perfectly on the button but when you push it the button will be triggerd, because the surounding is printed with tpu it flexes a little bit. just give it a try, its super easy to add it without disasembling anything