Those clips may be some form of standard light fitting, maybe for light tubes or something, difficult to tell.
I notice there is a wire between the two carriages of the monorail, is this normal or has he maybe fitted uprated batteries to get the better speed? The motors in generic Tomy trains should be ok for up to 6v I think so that may explain the speed increase.
As for the white tracks, quite likely 3D printed. It wouldn't surprise me.
