That should be strong enough if the glass is done right. You might think about some 8oz cloth with the 1708 if you want to have better strength off-axis of the 1708 fibers. I would consider vacuum bagging it to help get voids out and make the resin/glass ratio better - if you don't have a vacuum pump then a shop-vac can pull ~5" of vacuum.
My Sceptre came with 1/2" balsa in the hatches. While they ended up with a slight dish shape after 40 years, I am pretty sure that is from how the edges were finished and not from the core being too thin. Blue Heron's Fiberglass 101 thread has my comments about proper finishing of hatches in it.
|