Parts of Proposal: Contact the Expert

This is my letter to a expert:

Dear Professional,

I am from Bogotá, Colombia and I am in 8th grade and I am doing a project about Hover Cars.
In Internet I started searching for lots of time and found out that you were building a Hover Car prototype and wanted to contact you.

Here are a few questions for you:
-What size are you building your prototype?
-How will your car levitate?
-And why are you doing this?

Thank you so much,
Pablo Ancizar