Tesla (TSLA - Get Report) CEO Elon Musk is a visionary who thinks big, but don't trust his numbers, says TheStreet's Jim Cramer. Last night, Musk unveiled his long-awaited 'Master Plan, Part Deux' blueprint for the electric car company's future. Aided by the controversial plans to acquire SolarCity (SCTY) , Tesla plans to build a network of rooftop solar panels, expand its car offerings to include trucks and urban mass transit, perfect the cars' Autopilot function and allow Tesla owners to rent out their cars when they're idle.