Aamir Khan is all set to unite the Khans of Bollywood for his upcoming film 'Lal Singh Chaddha' This much awaited remake of Hollywood film 'Forrest Grump' is talked about for presenting Kareena Kapoor Khan and Aamir in never seen before looks to depict different eras one after another. Now, the current reports suggest that following the trend of this Era, Mr. Perfectionist has thought of bringing in Shahrukh Khan and Salman Khan for crucial roles but again having different looks representing two different decades having different looks and work profiles for the film. Further, it is also said the this upcoming film will be started with Aamir having a train journey and takes the audiences in flash back mode to share his story.