Salutations, Robbo. The link is good, but the page requires (for me) about 30 seconds to produce the 910 pictures (located just below the title "Porsche 910: Der erste Schritt zum Titel"). One-Mississippi, Two-Mississippi, Three-Mississippi...
By the way, everyone: I've already translated the site's accompanying text, and -- of course -- it yielded nothing regarding the subject 910's lineage, or else I wouldn't be asking my silly questions in the first place.
Ta!