A tank that size is quite easy to build.  With 1/2 inch glass you wouldn't need any top bracing either.  I have a 47x16x24 using 3/8 glass (made by hagen) that doesn't have any top bracing.  I love how open these kind of tanks are.  I built my own 42x20x20 the same way. 
		
	
		
		
		
		
			
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				Marcel 
 
How was I to know that Salt was an addictive drug?
			 
		
		
		
		
	
		
		
	
	
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