I have cut 8 gazillion strips of 6 oz
Ok, maybe only 8 bazillion, but still it's alot! I really have no idea what would be an adequate number of layers, so this is a total guess. I did feel that the rear of the stringer needed to have more layers, so I cut several of the strips in half and laid those up from the rear of the stringer build up.
I know that to the uninitiated this looks like a simple plywood table covered by a sheet of polyethelene, but in fact it is a sophisticated wet out table (trust me