For this i cheated a bit with my lamborghini. There are two bent axles in the roof and 2 mm stable wire ( stainless gardening-wire ) in all the hoses. The ends of the wires look out of the hoses, are wrapped with some tape and then stick in the Lego parts. With that, there are no partial shadows or thickening on the ends on the translucent tubes and the wire is invisible. For example, the wires for the roof run continuously through the front hoses and along to the back through the short hoses. This design is very stable and allows a faithful reproduction of the contours.
My favorite LEGO-Model. Thanks to stefan.
