Back in February, we told you about director Shawn Levy (Real Steel, Night at the Museum) signing on to helm the big-budget remake of the 1966 sci-fi film Fantastic Voyage for producer James Cameron‘s Lightstorm Entertainment and 20th Century Fox. Six months later, this project has still not been given the green light.

Why the delay? According to THR, the project is having trouble putting together the right cast and as a result, Levy may move on to other projects if this continues to be an issue. Levy seeks an A-list star to headline the film but that might not be what Fox had in mind as this will already be a very expensive film, heavy on the CGI. Levy is said to have a meeting in the near future with Will Smith (Men In Black III, Hancock) to star in the re-imagining of Fantastic Voyage. If Smith signs on, Levy will probably stay aboard and Fox would more than likely get behind a box-office proven headliner like Smith. Though the project is a priority for Fox, Levy may pass if the right cast is not found soon.

Levy has other possible projects on the horizon. He is looking to direct Fox’s Frankenstein film, Disney’s Maleficent, and his 21 Laps Entertainment is currently working on Ben Stiller’s Neighborhood Watch.

Previous to Levy signing on for Fantastic Voyage, Fox had been in talks with Paul Greengrass (Bourne Identity, Green Zone) who ultimately had passed on the project.

Fantastic Voyage follows “a team of scientists who are shrunk to atomic size and sent in a miniature submarine inside the body of a scientist to save his life.”

Fantastic Voyage is slated to hit theaters in 2013.