It does look as if a few non Meccano parts have been used but as you say brilliant. The rest of the video can be a distraction.

My collection of Meccano is safely stored in the loft for a rainy day, the idea of a Meccano Trusty has crossed my mind. Many years ago Alex and me attended the Old Lawn Mower Club agm, I took the necessary parts to build a lawn mower model that had appeared in the Meccano magazne, must see if I can find the instructions again.