I had some trouble with the first curve exiting the staging area; I found it hard to keep the radius constant, especially the weak spots where there was a joint in the spline. That experience led to two ways to counter the issues.

The first was to create a quot;formerquot; board of a known radius that I could clamp the spline sections to while they were being assembled. This takes all the point stresses off the spline laminations that are caused by joints in neighboring spline sections.
This former board is 29 3/4quot; radius and was made to construct three-lamination 30quot; curves (my minimum radius). Since this section is four laminations wide, the centerline radius works out to 30 1/2quot;.

I later modified this board by adding notches and holes for the clamps. This reduced the clamping span.