That makes a lot more sense now.
Yeah, just frame out the one wall, put a window in it for sure.
You might have to frame out the front of the car port space to match your soffit overhang to get your car to fit inside the car port. As it appears from the pictures.
I renig on what I said. You can definitely get this done under 5K.
If your around any large city, you can call your garage door companies and ask for a used door in great shape. Often times you can find a great door for super cheap.
Same with the window. Simple flanged vinyl windows are replaced all the time. For the use of a garage a used one will work perfect.