I'm planning on using a Catto 3-blade. However, it's looking like 12-18 months' lead time. I already know what engine and cowl I'm going to be using. Are there any drawbacks with ordering a prop now, and hoping it'll be here by the time I've got 35F to that point?
The only danger is that you'll change your mind before the prop is done. If you already have your mind made up go for it. I've got a Catto prop and I've been to his shop twice. He's a great guy, he does good work, and as already stated his props are beautiful.