>>11092554MP Ironhide is only a head shorter than MP10, and a 59 Caddy hearse is a much bigger car than a Nissan Vanette. The Vanette is about a 158 inches in length compared to the Caddy's 251 inches. The Caddy is also wider, at 80 inches compared to the Vanette's 63. The Vanette only gets a slight edge in height, at 70 inches compared to 66 for the Caddy (if you don't include all the extra gear on the roof rack).
Now that you know the dimensions of the real world cars, the idea of the Ectotron toy being Masterpiece scaled is laughable. He would easily be taller than Ironhide.