It will be cooler, yea....but safe for your components? no. Unless you can ensure that nothing at all touches it and no water gets dropped on it, then go ahead. Also make sure it's not on carpet and use the door from your old PC case to put it on.
Do you know anything more about the parts that you were given? Do you even know if they work/compatible with each other?
Do you know anything more about the parts that you were given? Do you even know if they work/compatible with each other?

