The "Airstream" trailer is not an ideal test subject. It has lots of reflections, and hardly any usable surface detail for Photoscan to determine the surface shape. Apart from the seams and rivets, it's all flat and smooth. Try finding something that is dirty and old, like a statue or a really old and dirty car.
Your photos have a lot of noise because your camera was at ISO2200. For better results the photos need to be as noise free as possible.
To improve the quality of your photos:
- put your camera on a tripod
- use a low ISO (ISO100)
- camera in A (Aperture) mode with the Aperture between F8 and F11
- use a remote release cord (so you don't move the camera while pressing the shutter button)
- when you convert from NEF to JPG, save at the highest possible setting (JPG Quality 12 in Photoshop).
Using JPGs is fine, but you have to save them with the highest possible quality to prevent compression artefacts.
Your photos are all more or less at eye height, with the camera pointing down for parts of the trailer that are low to the ground. Using multiple rows of photos will give better results (high, medium, low). So put your tripod at the highest position for the top row, at medium position for the middle row, and at very lowest for the bottom row. That way the camera position changes, which will make it easier for Photoscan to do an accurate reconstruction.
