What are the “usual” guidelines for choosing the correct size fin for various length boards. The depth and width for a 9’ board vs dimensions for a 10’ board for example. I understand this is way subjective as it relates to performance, style, conditions, etc., but are there some basic strategis or guidelines? I’m a surfer / furnituremaker and continue to get asked to make custom wood laminated (old-school style) glass-ons. Thanks very much for any insight!