Here's the Concourse B roof roughly halfway complete. First step was to establish the plan view... it's a 7-sided figure with each side divided into thirds. All of the ridges and valleys radiate from the center. The peaks and valleys transition smoothly into a flat slope going the rest of the way up to the top. The slope down from the top continues straight, uninterrupted, down the valleys. Therefore, the sides of the peaks aren't flat planes but are actually "twisted" along their length, so I divided the peak and valley lines into 16 segments and spanned them with a web of transverse lines. Next step will be to divide each of those resulting 4-sided spaces into triangles, allowing faces to be created, then smoothing. One near the lower center of this view is completed as a test to decide which way the diagonals needed to run.

