Ok my understanding of it is 
IF ; the vin number was issued to you by dvla not one made up by the builder then that number would stay with the issuing letter to the original applicant as builds take a varied amount of time to complete 
All vins now have to be issued by dvla therefore if it is a "homemade" vin then you will have to apply to kits and rebuilds , dvla for a new one or risk failing the iva at the first hurdle 
If in any doubt give kits and rebuilds a call on 01792782069 
		
	
		
		
		
		
			
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				remember we are not mad just creatively insane
			 
		
		
		
		
	
		
		
	
	
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