MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
Not a manifold just means that there are holes between the inside (where infill is put) and the outside layer. the holes are in the cockpit and in the center mounted turrets and don't cause any printing issues. I printed 2 of these, one at 50% scale and one at 75% scale, with both prints repetier gave me the manifold error and both prints came out great. Just slice it as usual and print it.