Veteran filmmaker Ketan Mehta is all set to direct the biopic of his freedom fighter aunt Usha Mehta. Reportedly, he is planning to make a big-budget period piece and currently, is busy penning the final draft of the script. The director will also recreate the city of 1930s and 40s for the movie. He took help from the historians to write the script and build the world of pre-independent India. Reportedly, Mehta aims to rope in Taapsee Pannu or Bhumi Pednekar for playing the lead. However, he is yet to lock the cast for the project.