Then you will have the whole front of the car motor and all hanging off the chassis rails / sill panels? supported by two little pads on the top of your stands
not a good idea for the long term.

I would consider getting some stocker rims and tyres.

Or if you don't have to worry about the floor and really want to go cheap, just use rims(?). Watch out for hills though, not much traction, and don't drive over someone's foot! Maybe this is a bad idea.