You can look at mine - we created a new room that had a window on the screen wall. I put some curtains on the inside of the window, covered w/ insulation and then a layer of plywood. And then the entire wall was clipped, channeled and drywalled over. Look at the first 2 pages.
Check out my build.. Link at bottom. FROG with double windows above the garage. Looks out into front yard but the window looks normal from outside. All depends on the ease of access to the window you want or need.