An easy tarp support can be made of 2x4s in a "spine" from the top center of the windshield to the top of the motor...then a second 2x4 from just beside the first one on top of the windshield to the bow rail. A stiff leg under the bow rail will give it the support it needs. Padding in appropriate places: top of the motor, top of the windshield and where ever you feel it's needed. I've used this system for years and works well, w/easy tear down a big plus when time to splash... 
 
If you don't like the idea of the top of the motor for support, an "A" frame from the transom should be easy enough to configure...
		 
		
		
		
		
		
		
			
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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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