Shakes: Welcome to the VF edge community-

what they mean is the furthest outside portion of the fuse sides, ie outside of the plane. Take the measurments from all corners of the opening to the opposite side's opening. Take those measurements and transfer them to a scrap ply template.

Salty: I can agree with what you say about it being to hot. Last few days its been in the near 90's-100's, and standing in a open field with no shade could really put you to a boil. Let me see what VF says about the balance issue...