The point on the lip is sticking out because you probably missed that when meging verts.

You really need to add a lot more detail to the lo poly cage because you're not really getting any benefit...

I was thinking of this as a vehicle for mining various ore from asteroids out in space. It would have some small maneuvering jets to jump from asteroid to asteroid and then bringing the haul back to...

Here is a sketch for a little Asteroid Mining Vehicle.
Cheers

http://www.expression.edu/~carrivas/MiningVehicle.jpg

This guys "IT" really rocks

http://www.ballisticpublishing.com/preview.html

Here was an "it" I made back in school
http://www.expression.edu/~carrivas/cyclepersp.jpg
http://www.expression.edu/~carrivas/CyclePerspRear.jpg