There is a little one called I believe the Aqua Sport by Mitch Polling. Although it was designed for electric the .10 should fit. I used to have the plan but gave it away not long ago. It came from either RCM or MAN. Coincidentally I came across the plan offered for download on a French or German site last week but I don't know if I can find it again. You could check the RCM or MAN sites. A long time ago I put floats on a Dynaflight Piece'O Cake and mounted an OS 10. It was a very gentle flier as you might guess.