The suspension system filled the floor of the hull. It consisted of 16 torsion bars running the width of the hull. These were staggered because the roadwheel swing arms faced forward on one side and backwards on the other.
Rigidity for the hull and suspension was provided by struts of 10mm thickness welded to the base of the hull. Two large struts ran all the way from front to back of the hull, through the engine compartment, and carried bearings for the swing arms. This cross section (facing to the rear) shows the two large struts:
Another item on the hull floor that can be seen in the above diagram is a pair of air ducts. This diagram is facing to the rear, so the narrow duct is on the right side of the vehicle. The narrow duct was used only when the vehicle was underwater; it delivered air from the snorkel tube. It was cut off abruptly at the center of the vehicle, releasing its air underneath the small gearbox that transferred engine power to the turret. The wide air duct went farther forward than the narrow one. At its front end was attached a tube connecting it to the back of a casing that surrounded the gearbox. This casing was not sealed all round; it allowed air to enter at the front. The other end of this wide duct was in the engine compartment, near the rear wall. In the middle of the vehicle, the wide air duct had a branch leading upwards to a fan, shown in this diagram from Tigerfibel.
The next drawing shows four smaller struts that run side to side across the tank. They are spaced at intervals of 515mm, matching the wheel pitch They pass through cutouts in the large struts. Every one of these transverse struts has its own cutouts and notches to accomodate various pieces of gear, but they all have the general outline shown here.
The 3D model below shows a general view of the ends of some torsion bars. You can see (and purchase) some good photos of these units from the restoration of the Bovington Tiger. Go to pages 11 and 13 of the Tiger Tank Journal.
This diagram shows from above the struts, including two half-length struts in the front of the vehicle which were 175mm high. At the very front of the vehicle were two short struts to support the transmission gearbox.
Here are the two longest struts, as seen from the middle of the vehicle. The large circles are the bearings welded into the strut, and the small ones are torsion bars. The diagram shows the holes in the struts, the four transverse struts, and the firewall. I have also drawn the half-length strut on the left side, but I have not yet drawn all the holes that were cut in it. A 3D model of this strut can be seen under my model of the driver's seat.
[1] Survey of vehicle 250122, Bovington, by David Byrden
[2] Der Panzerkampfwagen VI und seine abarten, Walter J. Spielberger, Motor Buch Verlag