Hi I'm Freddy, I was thinking of making a car and I wanted to ask you

Hi I'm Freddy,
I was thinking of making a car and I wanted to ask you a question. The car will be made for travel purposes and I want to make it as big as possible. What would the maximum width be for it? What would be the maximum length for it? And also would it be able to make it 3 floors like a bus but higher without it tipping over.
Kind regards,Freddy

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