Test fitting the cornice & soffit begun

This afternoon was one of those great times in the shop when I didn’t have to think at all. I knew what work I had and how to go about it. So just following the steps one-by-one, no head-scratching. I was test-fitting the cornice and cutting the first soffit board for the cupboard’s upper case. Above you see the 3 rails to the cornice and the upper square stiles. I’ve drawbored all those joints and fastened them with temporary pins. The next step was to find the height of a groove that gets plowed in the inner faces of those three rails. It corresponds to the top rails of the trapezoidal section. So I laid a flat board on those rails and marked the height at which it bumped up to the cornice rails. Then plowed a 1/2” deep groove in the long rail (the 2 short rails were already done.)