Hello design experts. I was toying with the idea of possibly building an RC hovercraft. I thought it might be fun, but i am really a "flyer" at heart. I like being in the air, and the hovercraft really is just a boat that can go on grass. ( not knocking it, as I still might build one for fun). So my imagination kicked in and I was curious as to why a hovercraft can't produce enough lift to fly higher than it does. I then decided that controling the thrust at different points underneath the craft would be one of the first big issues.....along with precise balance.

So here is my idea:
First, mount a .40 size engine with a 10 or 11 inch prop to the top of "box like" body. The engine will suck the air into the Cavity of the craft and theoretically compressing it. The air can then escape via Four vents or tubes at each corner of the fuse. I'm hoping that this escaping air would provide thrust. How much useful thrust is the question.
My next idea would be to add two more on the sides of the craft. These tubes would be able to point forwards or backwards independently, as well as control airflow coming out of them independently. This would ideally give me control over forward and backward thrust, roll, and yaw.
My idea to control pitch would be to use an adjustable weight that could slide back and forth to make the craft pitch forward or backwards.

I know all of this sounds goofy, but I think it would be totally cool if it worked. I'm skeptical though since i have not seen anything like it. That suggests to me that it is either impossible doing it this way or to complicated to make it work effectively.

Any thoughts on this idea would be greatly appreciated.
Thanks!