Cockpit coaming riser

Over the past couple of days I have gotten the cockpit coaming riser installed. I am making it out of two layers of 6mm plywood instead if the designed 4mm. My reason is so that I have a thick enough rim to install some screw-in snap studs, so I need the rim to be at least 3/8" thick. The snap studs are for the cockpit skirt I am planning on making. One of the Watertribe rules for semi-open boats is substantial decking (which the XCR already has) and a full skirt based on the one described in chapter 7 of Cliff Jacobson's book "Expedition Canoeing." Anyway, both sides of the riser are installed now, tomorrow it will be filleted and taped.