For fastening 1/4 or 3/8 inch thick hull sections to framing while gluing, I use the longest carpet tacks I can find (usually 7/8 inch). They hold very well, but yet release easily when pulled with one of those miniature nail claws (you can use a stirring stick to protect the hull surface). Cheap too! Fill the holes with epoxy, toothpicks, BBQ skewers, whatever.