Elon Musk is cooking up a memorable stock-market debut for SpaceX, and not just because it is expected to be the biggest one ever. The 54-year-old billionaire is writing his own playbook for the blockbuster initial public offering, which is being timed for mid-June before his birthday. While most executives are expected to travel to pitch their companies, Musk wants to have investors come to SpaceX, where they can visit manufacturing facilities and possibly witness rocket launches, according to people familiar with the matter. Musk and his team are betting fund managers and analysts will leave wanting to put in…