No, the kit is not new. The Legioss fighter and soldier are both Imai 1/72 kits. I did not really modifiy the tread at all. All I did was drill two small holes at the end of the extension mount, and into the groin area of the soldier. Then I secured the two pieces together by using paper clips as pins.
To get the fighter to fit right requires a little trimming of the arm sections to fit in the same area. The fit is so tight that the fighter is not even glued to the kit and the extension mount almost fits perfectly underneath.