Will you print this? Last time I printed some panoramas I put a heap into a single image. And printed at A0 at the local photo lab. It was some ridiculously large mega pixels and about 150mb. I didn't give much thought to what would happen to colour depth, but they printed fine and worked out pretty cheap because they were having a half price enlargement sale.
Have you seen or tried the specific pano papers for your home printer? Up to 36".