You should try for at worst +/- 1/16". Note that this could give 1/8" difference between adjacent forms which will be noticable. You should try to keep the error between adjacent forms within 1/16" as well.

> I was working on aligning forms along my strongback last night and found
> that 1) it's hard to sight along the marks and 2) it's REALLY hard to make
> very small corrections. To help with the sighting I extended the reference
> lines using stiff cardboard and I ran a string down the sides of the boat
> (not touching the forms) to measure to. QUESTION: how close is close
> enough? Once I aligned the tops of the forms to the centerline, it's
> pretty easy to get all side marks within 1/4 inch of each other. Should I
> shoot for 1/8, 1/16, 1/32? I want to try to get things aligned as good as
> possible, but not spend hours fiddling with it to no purpose.

> Thanks.