I have had the same problem here everyone has a big airboat and thinks anything smaller then 150hp is a kids toy. And when we say emt it is 1/2" electrical conduit from the hardware store. It's very light and easy to work with and plenty strong enough if you brace it the right way. My first airboat i brazed the rigging with coat hangars and brass rods. Now i just use the $90 flux core welder from harbor freight it welds the emt nicely just turn the wire speed up and move fast so it don't burn though. But I would build a new lighter stand because weight is everything. Also beefing up the transom will create even more weight in the back. To save time try to save as much of the rigging you have now cut off what you don't need and just basically weld legs on it to brace it to the bottom of another boat.
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