I have stopped and chatted with Mike at Metan-their shop is unreal. The work is excellent. Not a lot of guys are vacuum bagging on the cape. I'd lean to a hermco bracket since fiberglass, mine is armstrong and aluminum and just fine. But fiberglass eliminates the corrosion/anode/painting topic
. Single or dual is kinda of an opinion choice...as is engines-I would select an engine based on your local dealer/service comfort level/proximity more than anything between a Suzuki/Merc/Evinrude....