Heck he could just get an inexpensive round-trip fare to anywhere and could go up a few miles. Apparently this guy has never been in an airplane before or he would know the world is not flat ... and yet he wants to go up in a self-designed rocket? ha ha ha
I have been in a few and have never seen the curvature of the Earth.
I think you would have to get a ride on a SR71 to see the curvature of the Earth.