It can't be. If you look at the pic I posted, the outline clearly shows a circular hull. The nacelles are completely different too, sharing only a basic cylindrical shape.
It was probably Eaves or Drex who did work on this, if not Church, so perhaps a similar motif. The splashdown saucer didn't look so circular right at the last.
There looks to be a flat back edge to the saucer at least:
Hard to tell. I want to see Chris's ship on screen though.