tracked vehicles are a diverse group, but they are almost always fairly easy to model. First of all, the use of the tracks eliminates the need for any complex steering system (unless we decide to use a subtractor). Secondly, the suspension system is located either on the sides or on the bottom of the hull, taking little or no space inside the model, as shown in Figure 19-10. in fact, the hull of most tracked vehicles is a simple box with tracks on its sides and plenty of space inside, and it also functions as a body frame.
Tanks have large hulls whose space can be arranged in several
ways. After building plenty of tank models, i have developed a reliable arrangement: The propulsion motors go in the lower-rear part of the hull, with IR receivers on top of them. For modern tanks with large turrets, the receivers have to be moved to the very rear end of the hull to avoid being blotted out. The central part of the hull can house the power supply with the turret rotation mechanism on top of it. The front part can be used for the power supply as well, but not for the IR receivers, as the models are typically controlled from behihd. The turret itself can house the gun control mechanism, but it's also a goog, well-exposed place for the iR receivers if it's tall enough to house them. See examples of tanks I have modeled in Figures 19-11 and 19-12.