In his first public appearance since taking over as chief engineer for Chrysler LLC's midsize car development team, Mark Chernoby said the small "Project D" team is developing a global portfolio of products. He described the high-profile team as a "small, tight-knit" group of less than 100 engineers in Metro Detroit. The eventual replacement for a Chrysler Sebring or Dodge Avenger-sized car could take many forms, he said. That may include different designs for various regions. Chrysler vehicles sold overseas today are largely similar to their American counterparts. Top executives have said a midsize car that can be sold worldwide is key to Chrysler's turn around.