Hey Batman,
I don't have any experience with scenery designing in FS, but maybe this will help...
Once you have finished and have textured the EOD file, save it and compile it as a Macro. From there take the macro and place it in the Macro folder of your Scenery program. To get the macro into FS, you will need to use the macro in a scenery project. Once you have filled in all the data for where you want to place the scenery (Latitude, Longitude, Altitude and Heading), save it and then compile it. From here you can activate it using the Scenery Library in FS.
http://www.simviation.com/lair/fs2004sc.htmhow can see what it looks like be for I put in FS9??
EOD has a 3D Preview that you can use, but everything you texture will show up as one colour. In order to see how the hanger looks in FS, you would need to compile it and then look at it from within FS


I hope this helps

Regards,
Stratobat