there's a free skiff program in Basic on my website which will accept
dimensions of for a driftboat and display a bunch of calculated numbers.
it can be used to try various shapes and loads. it is a tiny bit imprecise
for fully rockered drift boats because it assumes a flat run in the
forward and aft thirds as recommended by H Chapelle. for the kind of
water driftboats are used in I'd pay attention to draft (shallow) and
freeborad (high) when carrying two people.

Greg Carlson's program comes with a a drift boat example if I'm not
mistaken. You can easily vary the length and beam (but not the flare and
resulting rocker) and see how the computed numbers change.

Either program can be used to decide how big a drift boat is needed to
cope with the weight of two people and then you can go looking for plans
for a boat of sufficient size.
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