floor panels 11 the floor panels 11 may be made from metal alloy or polymer a doorway may be cut out from the door frame 27 for receiving the door before or after the frame is welded hinges not shown may be welded or fastened to the door frame 27 the door frame 27 may include a plate and or l shaped beam welded to the structural frame 5 the mounting brackets 25 may be welded to the structural frame 5 the mounting brackets 25 may have holes formed therethrough for receiving fasteners to retain the cab 1 to the vehicle the fasteners may be conventional i e bolts or threaded studs the fasteners and mounting brackets 25 may be configured to retain the cab 1 to the vehicle during tip over or rollover i e have a similar design strength to the structural frame 5 the mounting brackets 25 may serve as the sole support from the vehicle 39 s chassis or main frame so that the vehicle chassis or main frame may omit a separate structure for the cab thereby reducing expense of the vehicle chassis design alternatively the fasteners may be frangible so that the cab 1 may detach from the vehicle upon a predetermined force exerted on the cab 1 during tipping or rollover of the vehicle configuring the cab 1 to separate from the vehicle during tipping or rollover may be beneficial so that the operator is not trapped within the cab 1 after the vehicle has rolled over such as if the door 30 is sandwiched between the machine and the ground and.