Lighter and more mobile version of the E-100 weight estimated to 92 t), armed with a 128 KwK L/55 gun
The E-90 or Tiger IIIS (Säbeltiger) is however a hoax (as the E-79) designed for the Japanese simulation game "Panzer Front" of 1999, and not a true paper project, one day conceived by a German engineer during WW2.

APC variant with engine compartment moved in front in order to provide a rear compartment for the troop with an access door on the hull rear plate. This compartment had a small machine gun turret. This arrangement did not make it possible to retain the bulky turret of the standard E-90. It was replaced here by a Schmallturm (developed for the Panther Ausf.F) armed with a 55mm MK automatic gun.
Is however a hoax (as the E-90) designed for the Japanese simulation game "Panzer Front" of 1999, and not a true paper project, one day conceived by a German engineer during WW2.