I made the centerboard blank today. I got some cedar from Lowe's. I pick through the pile and find the ones with as few blemishes a possible. I got lucky and found two 8 foot x 8 inch slabs. I cut one in half then ripped it on the table saw about 1 3/16 inch wide. Then I glued the whole thing together, let it dry, and ran it though the surface planer. I'll find a NACA profile that fits and shape the blade this weekend. I also found another gem. I found the original 1/4 rounds that backed up the splash board. They were in the pile of trash that accumulated on the floor of the shed. I cleaned house today and there they were. I'll clean them up and reuse them.