I'm not sure of the Roadster motor dimensions. From this image Tesla Roadster #55 and google telling me that the vertical part of PowerBuilt 1500 Pound Engine Leveler is 7.2", I measured the main portion of the roadster motor as 10" in diameter. I went to the Tesla store and measured the Model S drivetrain. It's slighthly less than 31" wide including the plumbing for the liquid cooling; The Model S motor is 11.5" in diameter. Taking those dimensions and this image, http://www.technologyreview.com/sites/default/files/legacy/0908_hack_x600.jpg, I roughly mocked up what the Model S drivetrain would look like in the Roadster after rotating it 90 degrees. From this very rough process, it looks like the Model S drivetrain could fit in the Roadster. The Model S drivetrain is quite small compared to the Roadster's because it's liquid cooled, they used much newer/better IGBT's in their inverter and it wasn't Tesla's first rodeo.