I'm going with the rest of the "peanut gallery" and agree that it seems a tad much. I'm not a fan of aftermarket rudders, and that's speaking from experience. The engineer behind this model's rudder had specific forces and dynamics in mind when he/she came up with it's final dimensions. If nothing else, purchase the boat and then get a replacement rudder that meets those dimensions as designed. Good luck regardless what you decide and do keep us informed.