RE: Time to get wet.
A couple more 1/2A boats.
#3, Upside down airfoil hull, flat up front transitions to a very shallow vee, Cox Black Widow, 18.5" long, 22.25" OAL.
#5, Flat bottom hull, Cox Babe Bee, 18" long, 21.5" OAL.
Max weight for any of these four hulls is less than 1#.