I can't help you with enlarging but doing a triptych with a view camera and contact prints is relatively easy, I find. When I do mine, I shoot all three negs identically (of course), process them together and print them together (but on different sheets). Afterwards, they can be mounted in a single frame or in three separate ones. I love the triptych approach, feel, and look and find it a resonable compromise to getting a panoramic ULF camera.