Hey nkey -
Assuming you have increased the scale bounds of your mesh which will be required if you want the smaller meshes to render at such a great distance. You will also want to make sure that your textures are not using any mipmaps which can be adjusted in the Texture Editor.
For performance reasons I would also suggest looking into developing an LOD system that replaces the smaller individual patches with larger patches which still retain the look of the individual ones as you pull back in space. Otherwise you will have some performance issues not to mention some possible Z Fighting when you pull back too far as the meshes are being rendered into a smaller and smaller pixel space.
Thank You
Eric Ketchum