I am going to build a set of carriage doors for my daughters' garage. It currently has a single roll up garage door about 7 foot wide so each door will be about 42" wide and 7' tall. I attached a photo of her front door which we are going to make it look like except the radius will only be half at the top of each door on the outside. I am planning on using 2x8 treated ripped to 7 ish to make the width with 6 boards. Also will have the window like the photo in each door. I am going to build a jamb and it will have a threshold. Also it will have a deadbolt and handle set like the photo. I am going to build a flat box to make sure it is perfectly flat.
Questions:
How should I join the boards? Dowels? Does glue hold well on treated lumber?
For the windows I assume some kind of molding?
I am going to prime it and paint it to match the front door. How long do I wait before priming treated lumber?
Do I worry about warping with treated lumber?
Thanks for your help.