Great ideas, folks. So where do I start? Handlebars, exhaust, paintwork, seat? What do you recommend?
I don't think that those bars will work unless they're behind a big fairing; otherwise you'll just be a sail, hanging on for dear life at speed.
I'd find some bars that look like they'd suit you, and try them.
At the same time, as has been mentioned, put on a proper exhaust. Those open drag pipes won't let the bike run right, and will annoy more people than they will impress with their racket.
Service it, change the appropriate fluids, oil the pivoting things, and ride it for 10,000 miles before you change anything else. By then, you'll have an idea of what the bike "wants" to be!
Lannis