Interesting build. These projects can be a lot of fun. I went the other way with a Roadster to end up with this:
swapped the tyres for Schwalbe cremes, removed overcoat/skirt guards, flipped handlebars, fitted old SR stem, swapped Brooks B33 for B17, et voila
The cables are still too long and I think it needs more refined brake levers. Apart from which, I'm very satisfied with the results. It's a very enjoyable ride