project car

Hi im just putting my feelers out to see what will be the cheapest car to rebuild as project. As i am looking for something to do with my daughter to teach her all she ever needs to know about car maintenance and also how to research items and plan costs as i will be setting a budget once i have found a car and done some basic research myself.
Any opinions and ideas will be considered.
P.s if you have any motobike ideas aswell im looking for a side project :)

Many thanks
John