Hey Tim,
That's not the "Funky Foam" Duck was referring to. That is expandable foam someone sprayed into the sponsons. Most today use pool noodles because they can periodically be removed and replaced when they get funky. Expanable foam, being not a closed cell product, tends to absorb moisture, oil, and other junk and gets heavier as it ages
.
Looking at the bottom, I do not believe it is a Steve Muck hull. I don't recall the Muck hull having such a steep ram wing angle of attack. As Rod said earlier - the deck insert forward either side of cowl is not the norm for Steve's hulls. I know Muck offered 7701 hull, my Father had built one for Randy Hagood quite a few years ago, But I don't believe this is one of them
The deck insert forward is similar to the 7704 Perry mold Ralph Henry had the last I knew. But I don't recall that hull ever having a 7701 style cowl.
Good mind teaser to entertain us on a Sunday afternoon. I hear the calling of my name by a Cuba Libras in the distance. Getting louder every second. CHEERS !!! Bob
P.S. Now What Duck. I'm out of credible guesses.