As far as I have understood, there is a consensus that 3D model placement is one of the first things we want to support. So I thought I would start by throwing a number of use cases on the table, just to get a feeling what would be required to do this. I can think of the following use cases: Place default FSX objects Place objects from an object library (BGL) Two variants here: a completely external library, or one that is going to be included in the scenery - these are identical with regards to placing the object, but should behave differently when generating the scenery. Place single objects originating from for example MDL files. These must be assembled to a library as the scenery is generated, and should support modifications like Arno's TweakMDL or my AutoLoD in an extensible way. I consider moving objects as outside of the original scope as I have not investigated how this is done in FSX, but if someone knows better than me that it is possible for a first release I would not object. Another possibility is to add the posibility to create object libraries - and then place the models as you would any other library. This would force the user to assemble the objects in libraries instead of having the program doing it automatically. Did I forget something obvious? Or less obvious?