I'm not sure if yours is a 79 if you have livewells/fishwells in the deck.  But I'm basing that on my own boat only.  I have a 79, and it has gas tank in the deck, with one hatch forward of the gas tank.  I have, and suggest you do also, moved batteries to this hatch which sits mid deck, just behind the seats. 
 
Otherwise, sounds like a great set of mods planned.  Check my recent posts for a few pix of my work, mostly maintenance vs mods.
		 
		
		
		
		
		
		
			
		
		
		
		
		
	
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