Had to laugh on the Leyland comment. I'm currently cutting down a nice looking row of them - more forward thinking than anything. They are getting too big after 15 years - though not really too big just yet. But in 30 more years, they will be way too big. Ours grew 3' per year. 33' tall after 15 years and 3' tall when planted. They are also 25' wide (about 12' up) - always round up the published growth dimensions which are usually 5-10 year numbers. Up here our issue is mostly bagworms, not the canker, though ours fared quite well.
Project looks great!