Another suggestion/recommendation - make your cockpit coaming FIRST
, particularly if you are laminating it or steam bending it.
You might find that the finished shape is not quite what you thought and then it may not correctly "span" the cockpit opening between frames.
My steam bent coaming (from one 32 x 10mm piece of green Spotted Gum) ended up 25mm longer and 25 mm narrower that the former's shape - had to do quite a bit of "persuading" with a hot air "gun" and temporary spreader sticks to get the shape back to what was required to land correctly on the frames and to allow me to pass thru the opening
Another Yost SoF builder in USA had to add 'padding' timbers to the aft end of the masik beam and fore end of the isserfik (rear of cockpit) beam to suit his glue-laminated coaming - see http://dreed.com/boat-building/SeaTour15/coaming.html
Have you made your GP yet ? Practice your woodworking skills.