Also someone made a real crossbow based on the image: https://loeffelholz-codex.org/en/codex/f014v.html
(Edited wording to correct for jacquesm's point)
(Edited wording to correct for jacquesm's point)
The owner of the site is an SEO consultant in Munich:
https://loeffelholz-codex.org/en/project/dirk-schornstein.ht...
And this person is Austrian.