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 Hi Brent. I don't know how thick the barrels are, but he's got stiffeners 
in there. Probably "stitch"welded. Look close and you can see the marks at the 
mid-point. 
I don't have any problem with the kid building with what he could find. The 
psub site is easy and free with a lot of info and it's says very clearly that a 
sub WILL kill you. If Jon or some body starts answering or coaching or 
whatever, it will lead to all kinds of bullshit. If that kid can build a sub, 
he's not all that dumb.  
Keep sending that stuff you find. We all find little morsels that are fun 
or educational. Frank D. 
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