Horizontal, black and white photos are custom framed in vertical mouldings with super long matboards. Just goes to show - don't let the orientation of the art determine where it will and won't fit. Anything's possible with custom framing!
Such a smart idea (feed old book pages through a printer to make unique silhouette art). Not gonna lie, I'd probably scan in the old book pages first, and use the scan for the final print. I love my old books, I don't want to cut them up.