Sandwich (foam or balsa) core is a great stiffener. But it really would be easier to start with a CC. I just got done playing with a lot of 1/2" divinycel H80. And 3/4" H80. It is great stuff, but an entire hull would be a lot of work. It works really well with 1708 DBM as far as I can tell. But I am burnt out doing bulkheads and hatch covers. I think I sent north of $2500 on foam, vinylester, glass and consumables (for my 25 footer). You would need similar amounts in terms of dollar value. And work every weekend it wasn't raining. I hear divorces are expensive, but I haven't gotten that far yet. I probably spent an extra $600-$800 recently on "date nights" to try to strike a balance there. Plus a trip to the opthamologist for fiberglass in the eye, and a few hundred in Ryobi and and glassing tools. Two respirators, extra organic vapor cartridges, maybe 8 boxes of nitrile gloves, two moon suits, 4 gallons of acetone, 20 squeegees, 36 2" wide chip brushes, a dozen paint roller trays, a half dozen heavy ( 4 mil) plastic drop cloths...
A CC really is cheaper. Especially if it has semi working electronics or controls. I probably have $3K in low-midrange Lowrance gear on the 25 and it still needs a real VHF and a better bilge system. Probably $1000 in ethanol proof tanks. It will need a few hundred in A1 fuel hose. Your 20 might be cheaper in this regard. It still needs anti siphon valves, ethanol proof line, squeeze bulbs, water separators, O/B controls and instruments, if you don't have them. And a T-top. Those aren't free.
And a 150 4 stroke is too heavy for a 20 , IMO. A 150 with an OK prop probably is worse than a 115 with an optimal prop for performance. And aluminum props are $100 each. That's a lot of guesses, and a few spares between a 115 and a 150 in terms of dollars. The 150 might have 3 MPH for cruise speed over a 115. The 115 will have better low end planing speed. With a F90 or an e-tec, you won't need tabs. I have never priced them, but between 400-600 bucks smells right. Plus 14 more holes in the transom. 4 per tab, 3 per cylinder. Times 2, plus switches, pumps, controls, fusing, wiring.
I can hang with some 25-26 foot makos in a chop with a F100 on a 20. With a 20 gallon tank.
Get a SF or Master Angler with a notch, I say.
If I had the money for a motor, I would try a 90 or 115 e-tec for the weight. But I have a $1000 4 stroke 100 hp with a 4 blade and fin, and 6 hp kicker. It was super cheap. Still too heavy. But I don't need trim tabs. And it floats with a holed hull the way I worked it over.
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