You can buld a real pram for the same amount of effort. You will even get something that looks like a boat rather than looking like a cement tub. The real boat is called the D4/D5 designed by a naval architect. The plans are a free download. You can build it as a rowboat or a sailboat. All the sailboat additions are in the plans too.It looks like this;
http://gallery.bateau2.com/displayimage.php?album=343&pos=20
The plans are here;
http://www.bateau.com/freeplans.php
As you can see I am not in sync with the "Duckworks" crowd. The thrill of building a boat that doesn't look like a boat illudes me.

: This probably isn't the place for this question and boat but here goes. I was
: looking for a small used aluminum Jon boat to use for spraying my pond but
: they were hard to find and sky high in price. But I can build this 4x8
: foot Puddle Duck "PDRacer" class sailing boat as my spraying
: boat and sail it also, a two for one thing. I have a nice leeboard I could
: use with this boat but I was thing of putting big skegs on the PDR in
: place of the leeboard but didn't know if it would work and hadn't found
: anyone who had done this. Then I found this picture on one in the UK and
: the captions was they were highly popular there with the skegs. But I
: can't find any in the UK at all to find out how well they work. Does
: anyone have any thought on this.

: John