Hi Yenmonger, great model, I hope you will show the final minuature when it is complete!

Re: closed in barrel - when you export from MoI try setting the option for Output: Quads & Triangles.

The default is to export N-gons (polygons with more than 3 or 4 sides) and some programs have difficulty dealing with those.

Probably exporting as Quads & Triangles from MoI will avoid the filled-in barrel problem, please let me know if it does not.

- Michael