Carlytos,
Thanks for your efforts doing this nice model. It's really appreciated. However, I've inspected your Corot model and there are several defects to work out :
1- Firstly, the 3ds file is pretty big (11.5 MB !) for what it is. Please, try to optimize your models. Remove all the invisible triangles, since they are also afflicting the frame rate in Celestia.
2- See the pictures below. There are some seams visible which could be removed in the modeler. Especially at the rear (circular part).
3- The gold foil is badly mapped. I think it could be better. On the picture below, I removed the foil to show the mesh problems.
4- There are holes visible on the "cylindrical" part. See the second picture below.
5- On the same "cylindrical" part, there are two invisible cylinders, inside the main tube, that needs to be optimized. There's too much triangles for nothing, there.
6- The white part on the panels, is this normal ? It's not of the same colors as the rest of the panels. Is it like this, on the real thing ? I may be wrong, but I suspect it isn't.