: Nick suggests placing the forward edge of each form in the forward half of
: the kayak right on the station line. For the after half of the hull the
: after edge of each form is placed on the station line. In my case this
: caused the spacing (forward edge to forward edge) between forms 10 and 11
: to be 11 1/2 inches, vice 12 inches for the other forms(1/2 in. form
: thickness).

: Some builders say the forms should be beveled to more closely match the slope
: of the strips where they cross the forms. In that case each of the forms
: described above would be moved 1/2 inch toward the nearest end of the
: kayak. This is a bit of extra work, but I think I would do it if I were
: building another Heron.

: I think my strongback ended up being exactly 14 feet, but I think that
: depends on how the end forms are attached to the strongback. I can't check
: it now because my forms are all covered with strips ;-)

My strong back is at 14' now. I am ready to cut it to fit the bow form, but I wanted to be sure first.
I roughly placed the forms on, and I end up with 10-1/4" between forms 10 and 11. If I leave the strong back at 14' this will translate to 11-1/4" (maybe 11-1/2 like yours).
The plans call for a 13' 11" strong back though.
I noticed that the plans have 11-7/8" spacing for the forms in the cockpit area when measured directly off the paper.