When shaping the rear of the fuselage, the plans describe the horizontal dimensions of the area to be removed, but what about the vertical extent?

Visualize a hot-wire cutter, one side fastened on a pivot 25" forward of the firewall, right on the edge of the foam at the "top" corner ("top" because the fuse is upside down). Now visualize how the foam will be cut if you take your imaginary hot-wire cutter and slide it along the firewall from the bottom to the small triangle of the lower firewall with the other end merely pivoting at the front. You will have cut out roughly a triangle of varying depth, deeper at the firewall and shallower toward the front (with no foam cut out in front of the wing spar cutout).

Stop shaping if you get down as far as the electrical channel (which most people seem to). As the plans point out, it is not very important how it looks ahead of the spar cutout as this area is hidden under the strake. More.

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