I strongly recommend turning the body copy black instead of grey. Other than that, looks good. Once the body is black, you may wish to revisit the large side numbers in grey as well. How hard to read grey type became a design trend I’ll never know.

For on-screen reading, 100% contrast (black on white) is actually a bit harsh. I think it's OK as-is. Maybe go with an 80% black (dark gray).

Good start. Hope to see it become a reference on design, culture and typography. I subscribed to follow it.

BTW, dark gray over white produces a better anti-alias effect than black over white in text size (at least on all Windows versions I used). But for the titles black would produce a more robust view.