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 Vance, 
I'm not the guy to do the calculations but I'd bet 
you would need to reinforce the slot your taking out of the hull tube similar to 
the way you have to reinforce around a viewport.  The forces in the hull 
tube would be trying to close your slot and would have to be carried across the 
opening with something substantial.  More then just the ribs in that 
area.   
Also, with the batteries in a box like that you 
would loose the protection in case of a battery explosion.  The way it is 
now, the pod end cap will blow off but you won't flood or get 
hit.     But,  Maybe battery explosions aren't such a 
big problem as I was led to believe.  
Dan H, 
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