Yes you can stitch: have 4x cameras, or move the camera and take 16 images, or a single detector are all going to work. My question is what is the lens/optics set up? I think the answer in understanding optics and or know the right terms and or understanding all the different types of spectroscopy. It's a bit to look into. It's seems someone would be publishing DIY things like this already, but I don't know the right terms to search for.