Re: Enterprise Pic
I wouldn't bother fastening two pieces of metal together at all. I'd just create the metal in a single piece in the desired shape and size. This could be done via transporter as I mentioned previous which beams the piece into existence en mass free of any defects.
I'm reminded of a quote from the TNG Tech Manual (paraphrasing): "If a starship could be created with the transporter, they wouldn't need it to begin with..."
"Even with all its blemishes, Trek XI still teabags the bloated corpses that were Insurrection and Nemesis and managed to make Trek fun again." - Sheep