Sorry for the smart-aleck answer earlier. It was a rather abrupt way of conveying essentially what Aaron did more politely.

I tend to appreciate the vision and creativity of others, but to my thinking, if you're going to attempt a British-inspired build, start with a British frame. There are plenty of British makers who made frames with the angles that were typically used as path racers. From Raleigh, to Mercian, to Ellis Briggs, Viking, Jack Taylor, etc. etc. I believe that Sheldon's web site and the ClassicRendezvous web site have good primers on the topic. If you can strike up a conversation with Hilary Stone, or Norris Lockley, or John Crump, you can pick their brains for a wealth of information "straight from the horse's mouth" so to speak. There are also plenty of others who know quite a bit, and will no doubt be helpful in sharing.

If budget, or lack of opportunity (or patience) makes the "authentic frame" option unachievable, it is always possible to match performance and functionality once you know what to look for. There might be some model of Fuji, or Centurion or Schwinn that could prove acceptable (conjecture here).

At any rate, you have a guaranteed support group here who can at least appreciate your efforts, if not assist you directly in moving them forward.