This is a cool, cool, project. I rebuilt a friend's road bike as a townie, and I very much enjoyed that the person who had built it originally (a friend of her husband, a bike mechanic and carny) had wrapped the bar's underlayer out of short bits of different colored tape. I think the only tape I have is used, wrapped around corks, but I'll look for fresh bits for you.
Philip
www.biketinker.com