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First you need to find the radius, it can't be 6". Once you've determined that set up a jig with a 1x4 with a nail to the folcrum and use it like a compass. You need to mark the front & back of the radius & the radii angles for each end.
Place nails for scribes at the interior & exterior unto a kiln(stable)dried 2x8 - 2x12.
Now you have a jig to cut your rails, all you need is the styles, ripped to the radii angles, cut your motrice & tennon joints & glue it up. With a slight curve you don't need to steam the ply. Lots of clamps & glue boards though.. one trick to give it depth and a nice "thunk" when it closes fill the voids with expanding foam before you place the 2nd skin.