We used to do a lot of "smoothie" hoods but it has kind of died out. We welded the rear cross member to the underside of hood and fabricated a center cross member. Allowed a full week for welding and cooling. About a 1/4 to 3/8 bead maximum with cool to room temp between beads. Very little warp and good hood fit. Picture is of a 49 that was taken to show one piece windshield but hood shown also.