I printed this last night... ok attempted... it worked great but Slic3r "fixed" the errors by filling some gaps.
Like... oh... the entire top. lol
so lessons learned: 1. check your preview before printing
your piece is a really nice design keep it up. thanks for adding to Thingiverse
you might want to pix up a tool like meshmixer or Netfab to help fix some of the errors if you too find issues in slicing.
there is still a free version of Netfab on GitHub if you're interested in trying it.