Hi NightCabbage, you may be able to make something work with Creature House Expression v3.3 instead - that's available for free here:
http://download.microsoft.com/download/a/5/d/a5d625a5-2e3d-4e9c-8608-6de48d7b569f/CreatureHouseExpression3_3.exe

That can open AI files that are saved from MoI, and it can export to PDF or EPS formats, which probably would then go into Inkscape.

- Michael