BobusMalus is French 3D modeler.
He created detailed models of Legtrax and Mainbody around June 2013, giving them a slight update/refresh.
It was his intention to allow them to transform and combine into the Big Dai-X but it appears that the Braincom unit was never finished to the same extent.
Equally, his model of Legtrax was 3D printed in a small scale along with several others.
The following ToyzMag article covers his work:
ToyzMag.com » BOBUSMALUS, un concepteur 3D de talent.
Many of the images below were found on this forum thread:
Modélisation 3D Big Dai X (Bomber X)
Andy Thomas - Dai-X
Andy Thomas - X-Bomber