It is ONE thing to design and model objects and vehicles for FSX, it is another to get them INSIDE the simulator after that.
Yes, Microsoft’s Aces team provided a way with xml files and this is included in the SDK. But it is not the most user friendly method.

Anyway, here are some links to programs and tutorials aimed at placing your objects into FSX.

Kukushkin’s Instant Scenery 2 is a wonderful tool. Available from Flight1.

Instant Scenery Forum offers support.

Of course there’s Fencebuilder Pro by Don Grovestine, that will not only PLACE objects, but also BUILD them on the fly ! Fencebuilder started as a tool for placing rows of ‘mesh hugging’ objects (such as a fence), but ultimately grew into something much more comprehensive. Check out the version in our store.

There is also a (limited) FREE version of Fencebuilder available, click here.