I am rebuilding an old Glasspar G3.I have 4 sheets of Okume plywood in the transom now and with the original fiberglass shell and glue it's 1 1/4 inches thick.Five sheets will have me very close to 1 1/2.I was planning on putting six which would make it close to 1 7/8.Is this too thick for outboard motors that hang over the transom? What is an optimal thickness for a transom since I can make it whatever I want?