By scratch do you mean you will build your own stand and hood/cap? If you are doing the woodwork that really changes the cost. You can save a bit by designing your own hood and DIY lights. Other than that.... 
 
I would go with the 120 you mentioned....new I would guess about $600 
Sump about $150 
I would go with the Euroreef RS180.....$450 
2 maxijets with the mod kit Chin has....$100 
return pump about.... $150 
 
With taxes thats about $1650 
 
Leaves about $350 for wood to build the stand and $1000 for lights...... 
 
I spent your 3k and you will still need to come up with a few bucks for plumbing, test kits and misc supply's. 
 
$3000 spent and you still have no water, rock, sand, fish or corals or......Im sure I missed something.....lol 
 
Scott 
		
	
		
		
		
		
		
	
		
		
	
	
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