Tesla Inc. (NASDAQ:TSLA) and SpaceX CEO Elon Musk has given an insight into what his proposed trillion-dollar fortune could look like as the commercial space flight giant gears itself up for an IPO this year.It's Not Like It's Sitting In A BankIn an interview with entrepreneur Peter Diamandis, Musk shared what a trillion-dollar fortune would mean. "It really just represents percentage ownership in companies that I built," Musk said. He added that net worths are more complex than just money in the bank. "It' ...