Traditional banca is ancient means of transport in Philippines, and in all SE Asia. Only name differs; banka, bangka, waka ama, vaka, va'a, wa'a. Pasific island all the way to Hawaii were settled with Yi people sailing bancas.
Firstly I planned for a sailing banca, called paraw in here. Still I dream of paraw. Maybe one day...
This project is a 24' banca, in waterline. Also with outboard engine which is slightly more expensive but pros so many. I go with Yamaha 2-stroke, lighter than 4-stroke (36 vs 50 kg). 15 hk should be (more than) enough, not a racing boat. Folks joking that banca's ideal position is upside down and seeking this all the time ;-)
You start with the keel. We go with sandwich construction, 2x 1" Santa Klara plywood. Traditionally karot wood is used but plywood getting more popular 'cause they say plywood lighter and stronger. And sea borers wont eat plywood.
Our builder from Santa Rosa, an island out of Lapu Lapu. He's been building many a banca. He knows what to do. No hesitation what to do next.
Word of the day: kasco - keel, hull