So much this. Why does nobody else have this trouble, or alternatively, why doesn't the software have a tool for auto-fixing it?
A-anyway, started over, and got a relatively glitch-free version:
Edit: Eyugh, Photobucket's gone feral. Somebody shoot it, put it out of our misery.
As seen on Space Station Five:
Of course, I have now completely forgotten just why I wanted a 3D model of this chair....