While we are not experts at manufacturing, we can pass along some references that we have for strake fabrication. Please refer to this article that provides equations for strake layout.
If you wish to subcontract the fabrication of strakes, we only know of one company that Specializes in this type of work:
Steve Shanks (Last known contact we had for this company)
Chicago Metal Rolled Products
P: 773-523-5757 x160
F: 773-650-1439