Pontoon plans

You could try plasticpontoon.com

It's funny that they only allow pontoon craft, as those are generally cobbled together and not as safe as a typical monohull.

 

Have a look at these ones.

http://www.logoboat.com/

 

I would find an old hobie cat missing the mast and sails, I've seen for under $500 often,
some only $100...