Blu said; "You can see the notch that I want to fill" 
 
 
Since the notch is no longer being utilized, it's just a matter of having something there to stop water from coming thru the notch...if were mine, I'd track down a piece of 1" Starboard, cut to fit, rout the edges to make it look good and put a #10 SS screw every 6-8" along the sides and bottom edge, finishing off w/4200 in the seam...it'd look great and dam that notch up for you... 
 
Luv your work, Blu!!...you really did a nice job on "er...
		 
		
		
		
		
		
		
			
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				'74 V-20/ BF 150 
'95 V-21/ BF 150 
'84 V-20/ 200 2.4 Merc 
'87 V-20/'18 F150 Yamaha
  
			 
		
		
		
		
		
	
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