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For N process stages on a 1366×720 canvas:

Available width  = 1366 - 4020 (left/right margin 20px10px each)  = 13261346
Available height = 720 - 50 (title) - 2010 (top margin)       = 658760

Zone width  = (Available width - (N-1) × 15) / N
Zone height = 320  (for process row)
Zone startY = 60   (below title)

Zone[i].Left = 20 + i × (zoneWidth + 15)
Zone[i].Top  = 60
Zone[i].Width = zoneWidth
Zone[i].Height = 320

Bottom panel:
  Left = 20, Top = 400, Width = 1326, Height = 658 - 320 - 20 = 318

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