Good stuff. With that in mind you can't go too wrong with a small displacement Honda. Obviously, you won't be covering too many motorway miles on a 250, but it should make for a fun little B road bomber.
I don't see too much wrong with your inspiration pic but just a few things to keep in mind:
1.) Lack of a front fender (or at least a fender brace) will degrade the handling of the bike. It may look good, but it will feel worse.
2.) A two into one exhaust system will usually provide better performance over two separate pipes (and is often lighter as well).
3.) No rear fender will cause your paint to get chewed up by grit and dust and other road debris...