Handle is on the fender side, so my guess would be that it lifts off. hinged open it would be in the way of the door. 
 
the platform that the genny mounts on looks lower that the original step, and is lengthened to provide additional strength. that would imply that the cage could still be on it. 
 
Agreed, the ridge could be to provide strength and a better grip for foot step.
		 
		
		
		
		
		
		
			
				__________________ 
				Charles Fitton 
Maryhill On., 
Canada 
  
too many carriers 
too many rovers 
not enough time. 
(and now a BSA...) 
(and now a Triumph TRW...)
			 
		
		
		
		
		
	
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