Whilst doing further research into Mastermodels I came across a longer silent film at British Pathe. It appears to be out-takes and cuts from the footage posted previously on the blog. It includes a short section featuring the Zero X on a workbench as seen in this blurry screengrab, around the six minute mark.
It also features more Joe 90 Macs car and lots of bi-plane and jet model making. All in all quite fascinating. I have let Andrew Barr of Mastermodels know too.
Click here to watch the video on British Pathe's website.