This has got to be the most inefficient shipyard in existence! Do you mean to tell me that they haul every individual plate out there by hand, one at a time? No carts, no nothin'? If they beam the stuff out there, why can't they just beam it into place, with some sort of self-bonding agent, so they don't need to weld it? Besides, I just can't buy that that far in the future, we'll be welding these things, anyway - adhesives, nanotech weaving, you name it - not welding.
Also, that must be one hell of a strong neck to support the entire saucer in one G - where is the cradle? Or do we assume that they're using anti-gravity to held it up at the same time they're using gravity to walk around on and in it?
Nice shots, tho