I'm using Ross's internal hatch holddowns method on my Expedition Single. I'm about to glue on the hatch hooks and wonder if I have enough glass on the hatches before I proceed. I have 1 layer of 6 oz.on the outside and 1 layer of 4 oz. on inside. The hatches are oval and are average sized. The internal system may apply more stress than external straps or bungees. Any ideas appreciated.

Thanks,

Larry C.