Sterling is long out of business and I doubt Estes, who bought them, has any plans to protect the copywrite. So I don't think legality is an issue, or at least one I would worry about. I'd be completely happy if someone gathered up all the plans and sold copies of them. I've bought a few sets of Royal plans from a guy on ebay, goes by "u.s.wings". He does a great job and provides excellent plans. Unfortunately, as people have pointed out, the Sterling plans don't have templates.