I have fully welded the frames RS1/2/3 and 4/5/6, I have minimzed distortion by tacking the frames to my bench when welding. The result is 2 flat C shaped frames ready to weld to frame and upright.  
 
I have ground the welds flat so uprights sit flush on top of lower frame and, obviously, under upper frame. I was not happy to put the uprights in place without welding up the frames. 
 
See my blog for picture, more coming soon. 
 
I have not built the transmission tunnel yet but up to now I dont recall having this problem of 'hidden joints' anywhere else on the chassis. Everywhere else I have tacked only and will weld later. 
 
Cheers 
Leigh 
		
	
		
		
		
		
			
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				My Blog : leroysroadster.wordpress.com
			 
		
		
		
		
	
		
		
	
	
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