Neat idea, if you add in some longer diagonal braces like the side's & back as low as you possibly work with that should work well. And if you have the room run a second tube to the underside of the front top horizontal tube. 
 
By the way did you use Google Sketchup? If yes, How did you upload the pic. 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
	 |