Then all I needed to do was to align the uprights with the laser and screw them in place.
Used small wedges to get the uprights level
The beauty of this metod is that even if you strong back is a little uneven in height you can correct this when you fit the uprights.
Then I test fitted the bottom plank and it fell in a smooth curve touching all the uprights, jippiieee!
It looks like a small hump at the left most upright but that is just my crappy phone camera.
Tomorrow I will trim the width of the uprights, bevel them on top and screw the bottom to them, so that will then be the official "Keel laying" date.
Time today: 1.5h (come on it is Friday, right!)