So let’s start off with the fact sculpty and I don’t get along that well. So I’ll do an non traditional route, building a model by laminating layers of 1/16” balsa.
The base dimensions are 7” x 1 3/16 “. The core of the body will be 3/16” mostly so I could have a thin fin dead on centerline, the head will be built up with 3/16 or ¼ balsa full thickness about the first 1.5” tapering down to body thickness by 2”.
Does that “feel” about right
Picture to my sketch
Orange full thickness
Yellow 3/16
Blue 1/16
Sprue and vent in scribble
http://www.myhostedpics.com/images/aulrich/wiggly.jpg
Thanks for taking a look