ok, I get it now! hehe finally.. I was not sure but considering that i already made a hole which is wide in my opininon, I'll keep the simple entry then, that would probably look weard with a refine entry in the existing case. I'll draft a drawing to compare.
For the fact that we will not see them, it's ok DL, I'll have plenty of possibilities to show some more of joineries later in other places.