Some time back in Fla I built a hardtop for a friend's 52'er. Doug fir supplied the ply and the solids. ( Ya I know, there is a lighter way but that was what he wanted) To bend the curtian rails we made patterns out of 2x stock for the forward curves and cut down the 90 degree bends at the back so they were ~16" long. At the 90s ( not 90 but curved through 90) we used a 3 peice lamination and backed it with aluminum strips left over from another project. A steam box of sewer tube, radiator hose, and a steel gas can made up the jenny. We molded the corners wet and epoxyed them when dry and shaped. Then we trimmed to fit. Wonder of wonders all 7 peices fit like we planned with a minimum of straining to fit the back corners. These are fun projects when they go right.