This design was very similar to the original 'Tiger-Maus' proposal, but had larger 900 mm diameter road wheels and a new spring based suspension rather than the original torsion bars. A new turret was designed; intended to be simpler and lighter than the Maus turret. Permission was given to produce the tank based on the potential use of the E-100 as a tank destroyer with either a 15 cm StuK L/63 or 17 cm StuK L/53 gun.[5][6]