Martin358 has the idea, +1 for making a wooden model and having it cast. I worked for a short time in an aluminium and brass foundry when I was about 20. I needed to fit two carbs to a Triumph 500. I made the wooden manifold model and had it cast in aluminum. Wasn't difficult even for my first go at the process. Made a half dozen more and sold them to others in the same situation as I was in (getting anything from the UK was really difficult). So, if you are going to make one stock, don't. It is just as easy to make half a dozen more and sell them on to others who also need them.
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