I have some 3/16" styrene angle (equal length legs). If I used that it would look like the attached screenshot. Strakes should actually be parallel to the water surface (although as shown, might actually increase lift by deflecting the moving water downward). Any "L"-shaped pieces would probably have to be trimmed to get them parallel, and the question then would be how to do that accurately for for several pieces up to 16" long?
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