The photo of the prototype on the IMDb page

The still from the film, on this page

http://www.imdb.com/media/rm4077555200/tt0097336?ref_=ttmd_md_nxt

shows something that slightly resembles the bomb that was first tested.

But it's so ridiculously out of scale, I can only hope it wasn't meant to be the same as the real bomb.

Anyone who's seen the film, tell me, is it meant to be?