Yes, yes. Can support with stringers running the lenth of the boat, either
triangular cross section as suggested, or at right angles like an I-beam.
Also frames accross boat to retain shape. But remember, the fewer pieces
there are, the faster and easier it will be to build. For example, if
bottom is V-shaped or W-shaped instead of flat you get quick and easy
support from folds without cutting. Long and narrow is faster than short
and fat. Minimize two kinds of drag: a) amount of surface friction with
water, b) amount of waves made (that's where long and narrow comes in).
Turn boat over, tape plastic to outside to waterproof.

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