The worldâ€™s largest childrenâ€™s museum is getting bigger. The Childrenâ€™s Museum of Indianapolis plans to build a $15.7 million expansion with 37,500 square feet of new space including a welcome center, bus driveway and bike port. The project is slated to begin in the next few months and should be done in time for the arrival of a blockbuster King Tut exhibit scheduled to open in June 2009, said Craig Emsweller, the museumâ€™s vice president of operations. A preliminary rendering shows a towering glass entryway with a large dinosaur peeking inside, mirroring the dinosaur statues outside the Dinosphere exhibit. The project will extend a skywalk into the museum, provide a safer entry drive, add new landscaping and relocate a library branch within the museum. Funding will come from a $12.5 million Federal Transportation Administration grant and a 20 percent local match. It would be the largest expansion since 2004 for the 433,500-square-foot museum between Illinois and Meridian streets at 30th Street. A hearing on the project scheduled for today likely will be moved to Aug. 14.