Install replacement window in new constr
First off I’m not much of a carpenter so be gentle (woodworker trying to learn carpentry WHILE building a workshop). I got a deal I couldn’t pass up (IE free) on 2 vinyl windows that are replacement windows. They are a 3’4″ pair with a H channel mullion to pair them. They don’t have a nail flange and are only about 2″ deep. I need help understanding the best way to install. I know how top frame out the rough opening with a rough sill but don’t know where to go from there. Being only 2″ deep I’m not sure how or if I should build a wooden frame around them before installing in RO. Any help would be greatly appreciated.