I am unsure on how to begin trimming my forearms.   My understanding is there should be no return edge on the wrist side so I should cut out the below as drawn correct?     For the edges should I cut out the entire shaded green area?  or leave a portion for the butt and cover joint?   The top of the fore arms should have some return edge from my understanding.  Probably start here and sand down as necessary?   And the other long side of