However, I think you might find it easier to build the openings and then fit the frames inside, making them on the spot if you can. All mine are out of wood, which is obviously flexible. However, we built around the sizes of doors we already had. SO size was important and it all worked. Mud brick housing is traditional in this country.
Construction lacks durability, particularly in heavy rains, flooding or tornado speed winds.
Hmmm, I guess the mud is not compressed which would tend to make it a little more vulnerable to the elements. However, you would have few problems with rammed earth. It would be appreciated if you would let us have more details as building methods. I don't think it would be worth the effort of building it. Basically it was 17mm formply on steel frames for strength.