: The instructions are correct. The strongback needs to be an inch shorter than
: you would expect.

: The primitive diagram below might help to explain.
: Imagine each section on the ruler at the bottom is 12".
: Imagine the vertical forms are 1/2' thick.
: You need to shorten the strongback by the thickness of a form at each end. ie
: 1" total off the length.
: The gap between the middle forms is only 11", but the only distance that
: matters is the distance between the form edges closest to the ends of the
: strongback.
: You will notice that they are each 12"

: All of this assumes you fit the forms attached to the stems on the end of the
: strongback. That is the recommended way and the way I did my Night Heron.
The forms at the ends of the strong back are set up to mount flush with the end with the plans I have. (Instead of off the end, and I assume mounted on the end form).
this only gives me 10-1/2" between forms 10 and 9