Any valid 3DS model should be usable with Celestia.
Note my use of the words "valid" and "should".
Too many model makers don't pay attention to the surface normals. Celestia only draws surfaces if they face toward the observer. Many 3D display programs don't make this distinction and always draw all of them. As a result, many models that look OK with some display programs seem to have have holes in them when drawn by Celestia.
Also, some bugs were introduced when Chris rewrote the model code in Celestia v1.3.2 and added the CMOD format. Surfaces that have translucent textures applied to them aren't always drawn correctly.
Another problem is that models used for DSC objects aren't depth sorted. Instead, the surfaces are drawn in the order that they're declared in the model. As a result, depending on the viewpoint, facets that should be hidden behind others often aren't hidden, while facets that should be drawn sometimes aren't visible. Models used in SSC catalogs are depth sorted, however.