I had been doing some cad work on a single carb manifold which would then work for a shorrock C142b supercharger as well. With all the air flow analysis available on solidworks it was quite easy to optimise it as far a possible with no particular expert knowledge. It is remarkable seeing what a few degrees of taper in the plenum chamber do, or as you say burdekin, a more generous radius on each of the cylinder feeds, for air velocity and equal delivery between cylinders.
I was designing for casting as I can do that myself but given how cheap it is now to send things out for cnc machining I wonder whether it would be worth redesigning. Interest levels peaked before I got to acutally making it....
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