You are maybe right about that. Normally when hand laminating on wood I arrive to 800grams epoxy for 1kg of glass. It would be funny to check the difference if you pre coat.
There is another thing that in my opinion can save a lot more weight had the case on the DS12. One hull was made from ply stored for a year in dry conditions, and the second that came straight from the supplier (stored in a cold store), and I have a difference in weight of 800 grams. As I make my epoxy by weight not volume I normally note everything that I use and there is no difference of any importance there.
Maybe we should start a new weight watchers thread.