RE: source for float plans
Here's one article..a little more complicated than it has to be, but very nice floats when finished.
[link=http://www.smilesandwags.com/Floatsite/Foam%20Float%20Core%20Construction.docx]Float construction[/link]
Here is the classic Cunningham article:[link=http://flyinglindy.homestead.com/skisandfloats.html]Cunningham[/link] These are basic, easy to make floats and they work.
You can fine tune the design later.
Thanks for the kind words, Stan