Unfortunately that ESC motor combo is not ideal for boats, boats have much longer duration current peaks that are harder on ESCs than cars as a result you would ideally want a much bigger Esc for that motor or a much smaller motor for the Esc, while it can be used and is on the high end of a good KV for 3s it is much bigger and heavier than your Esc needs, do you have any of the smaller 540 1:10 motors with 3000-3500KV knocking around? For 3s and an Esc that size I would usually suggest a 2860 motor but a typical car motor would only be 50% heavier than you need instead of over double the weight, you can use coiled alloy tube to cool their open cans.
As you want to build your own I would suggest you look at ne-stuff for plants build from or base yours on the JAE.12is a good boat and around the size you want for the power your Esc can handle, you may have to move the rear boom tube, and bulkheads around or even increase the tub height a litte to fit in your unorthodox powertrain though.
I get the impression that speed3 has a much more capable ESC than you that is watercooled, I wouldn't run the props he mentioned on 3500KV unless it is only for a few seconds. A 35 or 36mm prop would be much safer for your ESC, and in a JAE.12 should give speeds in the mid 40s.
Paul Upton-Taylor, Greased Weasel Racing.
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