So how about you put a core in it. I don't mean to bag on your dad but it doesn't sound like he is to educated in cored boats. Just doing a crazy thick lay up to get the strength of the core, balsa or composite, will add big numbers to the weight of the boat and also removes the ability for the hull to flex a little. There is a reason these boats were built this way. They weren't doing it to cut cost or make them easier to build that's for sure.
Go get your boat, get everything, and I mean everything, out of the boat and with use balsa or pony up the bucks for composite, and put the proper core back in it. Otherwise, cut your losses and give it to someone who will do it right. Your only cheating yourself and the safety of others by half assing it. Do it right out don't do it at all. Just saying...
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