What I find fascinating is that "pumpboat" hulls are built alike, no matter what size; the smallest paraw
has parts similar to the largest basnig
Hull bottom is dug out from a log; there is no keel. Floor boards made of bamboo slats are usually placed across the top of the dugout. Motor mounts are sculpted on the log in the carving process.
Hull sides are attached to frames mortised into the dugout. Most sides are now plywood though I have seen sides of some older boats made with solid planks caulked with asphalt.
Frames, stem and stern are usually straight; the curved ones I have seen are cut, not bent.
The sides are attached with copper nails and epoxy glue to the frames and are rabbeted to the top edge of the dugout.
Amas are bamboo (sometimes GI pipes) and natural knees are attached at the outboard ends to hold the outriggers: bamboo or large-diameter PVC pipes. For small boats the bamboo ama is bent to shape over a fire.
When bamboo is used as outriggers, it is usually skinned. The best explanation I got is so that it doesn't split when the bamboo dries when the boat is hauled out.
All the parts are lashed together with monofilament lines.
The whole boat is coated with enamel paint.