This is the second top I made for this flat-topped Medieval fiddle. Thin, fragile spruce. Maybe a bad choice on my part. The plans called for two cross braces, but looking at it, flexing it, with the two braces in place, I decided I wanted some sort of bass-bar. After all, the plans do call for a soundpost. Guessing on the brace dimensions -- it is an experiment.
After cleaning up the rib-side edge a little, with final shaping to follow, I glued the top to the ribs. It's a box!