: I agree, and would add that when the strips go on they will tend to
: straighten, exerting thereby a force upward at the stems. They have quite
: a lot of leverage out there, and can rack the end forms even if they are
: 3/4" plywood and nailed down tight. If you're using an external
: strongback you can build the stem form oversize on the deck side,
: extending all the way to the strongback and fastened to it temporarily.
: This is less likely to be a problem with Nick's internal strongback,
: depending on the length of the taper - longer is better.

Short of using a metal internal strongback, I clamped the strongback down and got it close to plumb. Then I attached the end forms and made them perfectally plumb. I checked that they were on the same line by attaching two 12" steel rulers on each endform and sighting down them, any error in alignment shows up quite well. Then I attached the rest of the forms and adjusted the height and level. This is about a two to three hour job. The biggest problem is devising a system to fine tune the leveling. I clamped a 4' level across the form being aligned with a 2"x2" on the oposite side. The 2"x2" was modified with two "T" nuts on the side facing the mounting cleat. Alignment became a simple matter of sliding the form to center it, then with bolts through the "T" nuts, adjust the level, recheck the centering then screw it to the cleat. When they are all mounted, a final alignment check is preformed by eyeballing the gridlines that I leave on the paper when I print the forms . This allows for checking both horizontal and vertical alignment, half the forms can be viewed in this manner from each end. Its simply amazing how even a small misalignment jumps right out using this approach.

Greg