sounds good.
keep in mind though on the building board the ribs on the cap are built a slight angle, so when the joiner is installed the ribs are all
plum, or straight up and down once the wings are joined.(to compensate for the dihedral)
you would have to change the angle of at least the first rib on each wing half at the wing root so they will mate correctly.
I would consider changing the angle on all the ribs there after to make the whole wing uniform.
if you have a percentage guage you could make a dihedral guage to simplifiy the process.
They sell these guages at any rc hobby shop.
Good luck! Scott