Hi Conrad

Looks interesting ,- I built a similar flat bottom hard chine 20 footer , though some time ago .
Used the stringer frame method per Gougeon Brothers -West System expoxy with spruce stringers marine plywd. and 3 mm skins ,--fairly simple if you set up a strong back to hold the bulkhead frames in place , as the force of bending scarfed plywood panels will try to pull it out of shape ,--as you know , or ideally have help and attach both sides together .
For a home builder this shape is very easy , another good reason to develop this shape planning type hull further.

I could not make out the lines exactly ,it looks like there is a little flair out along the aft waterline via older powerboat designs . looks good . Could not see the step at 16 ft aft .. The bow looks unusual with the knuckle and straight line the first 2 ft or so .

The 20 design had much more rocker and curved upward from mid point forward progressively more . It weighed under 40 each hull . not too bad .
One interesting feature I tryed was molding in two shorter skegs on each hull along each chine , the idea was not wanting to disturb the flat planning area along the hull center . The original looked like a double dart type skeg .
It would take the beach better that way also.

I experimented with an angular rig at the time also on it . lots of fun .

You might look at the Formula 16 class ,-if its a 16 ,
It has a 230 min weight , 28 ft mast L -
varied sail area for one or 2 .
Some excellent boats to race with.
http://www.geocities.com/F16HPclass/

What type of mast section are you looking for , some may help there , check out the Formula forums also .

thanks for the plan view -
all the best
Carl