Update of my progress.
First step was to remove the sprocket from each side of the hull. Be careful dont force too much.
Once the sprocket has been removed, you can see the bolt of first suspension arm. Remove it with great careful.
Gently pull the wheel upwards until the arm is completely vertical to the hull and pull the arm with wheel out of plane. Until here, you have successfully removed the first one.
Once the first wheel has been removed, you can easily see the bolt of second arm. Do the same steps described before and you can remove the second one.
Third arm..
During the removal, be careful of week plastic hull as you might damage either the hull of plastic arms which is hard to repair. Once 16 arms have been removed, you will get a clear lower hull which you can do whatever you like. For my case, I strength the hull by adding some plastic strips.
