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			 To cut out your "rectangle", drill 2 holes, then cut along the bottom of the 2 holes and join them, that will make your slot.  You can silicone egg crate in that rectangle, construct the box out of glass with a hole drilled at the bottom of the box.. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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