I spaced my frames 6" apart. The reason was so that when you start squeeging resin out of the inner skin of carbon you don't push the foam out of shape. To get a good laminate you need to put some pressure on the squeege. Even though the bead and cove joints are glued together the foam is still very pliable prior to adding the inner skin. You should be looking for a 50-50 weight ratio of carbon to resin.