Great video, like seeing more examples of using Ibis in other ways than anime, I also use Infinite Painter and your video series on brushes helped me so much.
Your video was so informative for me, I LOVE THESE tutorial step by step videos! I had the same idea of using brush strokes as references for either buildings or landscapes, then add in details with colored lines. Im glad this is a thing, because sometimes, I dont feel comfortable drawing technical architecture line art (although theres nothing wrong with that technique, its just not for me).