I would say that would be acceptable. Maybe a layer of CSM , 6 - 8oz cloth. The liners on the Wellcrafts were not very thick. I know yours isn't a liner but 2 layers of CSM would encapsulate. The smoother you make it the less time you spend sanding and fairing. I have never worked with 1708 (only 1208, heavy tri-axial, CSM, 4oz hardware cloth and 24 oz woven roving) so how smooth is the 1708 after wetout ? I have put CSM over 1208 and woven roving when I knew I would have to grind it back significantly in order to make it straight.