I have to agree about the OP’s construction method, it will lead to the loss of his boat in the surf. A model that large requires much more strength than a 24” model does. I suppose he could cover the paper hull with several layers of fiberglass and with enough internal bracing it might hold up. Might. We don’t want the OP to fail right out of the gate.

A better solution is to buy a used fiberglass hull on eBay, etc. Besides, wouldn’t he rather be fishing instead of building an inadequate boat, losing it, then having to build/buy another one?

As for radio range, that depends on radio quality. I have tested my Spektrum radio out to 900 feet - with the boat on fresh water. No idea how saltwater will effect the range.