Scott's Woodworking - presson
The slats have stub tenons on their bottoms and are mortised through the top rail.  I cut the mortises in the top rail while it was still square, then cut the curve out using the template I made.

The slats have stub tenons on their bottoms and are mortised through the top rail. I cut the mortises in the top rail while it was still square, then cut the curve out using the template I made.