Here is a bracket I built for a Thompson canoe I used to have. I'm posting these pictures to show how I overcame the torque problem (twisting) that an outboard applies to a bracket. Keep in mind that the lower unit of the outboard is actually trying to twist the bracket (long lever arm). I built the arm off the back of the bracket and diagonal to the base of the mount to address this. This allowed the bracket to be much lighter yet very resistant to that twisting motion. The whole bracket clamped on with two bolts & wing nuts.
Maybe this will help a bit if you decide to build one yourself.
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