Placed and drilled the oil service access door on the cowling. Clecoed in place, I traced around the opening and epoxied 1/4" foam to the backside. i then covered the entire door with one layer of BID fiberglass and clamped it together until it cures. The RV10 oil door has a slight curve in its design, so to maintain that curve, I used the cowling cutout when I installed the clamps