Here is a pic of a window fastened with the kreg pocket jig. You can caulk the outside. I would use vulkem caulk. https://www.backyardchickens.com/content/type/61/id/6191761/width/200/height/400[/IMG.
Here is a close up.
[IMG]https://www.backyardchickens.com/content/type/61/id/6191766/width/200/height/400
Here is a close up.
[IMG]https://www.backyardchickens.com/content/type/61/id/6191766/width/200/height/400