I fit the bass bar to the inside of the top yesterday, and glued it in place. Today, the fun part of trimming it down to shape. I get a kick out of running the thumbplane along the upper edge and taking off long curls of spruce.
Here's the finished bassbar. This one has a somewhat higher arching than my last fiddle, which also shows up in the shape of the bar. After rounding the outer edge, I'll glue the top plate onto the rib assembly.