ANY COMPETENT starship builder would have basically a WIRE FEED of materials to the ship.
Imagine it this way.
You're building in SPACE in Star Trek.
Your main limits on building are MATERIALS and EMPLOYEES.
YOUR SHIP is built like a scale model with prefab parts. So what's the most efficient means of assembling a ship... in space... with speed and accuracy? LOTS OF WIRES.
If you're not building like Hasbro Transformer toys, then you're building like a model kit. Now imagine guide wires connecting every chunk layer to another. Like a disassembled sandwich with 4 wires linking all sandwich layers together.
Now you can reel in components easily and accurately. The biggest danger is doing it too quickly. So you'd need a gyroscope array to cancel momentum to prevent the equivalent of dropping a bunch of dinner plates on the assemblers. But with the right attachment points, you could reel in, rotate and easy assemble like a cheap rubberband tensegrity toy (push up puppet).
Scooby-Doo 1977 Push Puppet
https://m.youtube.com/watch?v=tuLmi_LffQ0
Now imagine assembling the saucer using this trick. Pull in all bottom plates, you get a quickly assembled bowl shape. Note that "WELDING" in Star Trek is no longer is edge melting, by heating & cooling, it can be genuine molecular fusing as if the material was one solid substance since you can literally teleport it into an unbroken structure. In fact, like human skin, you could merge multiple layers of complex woven structures into a seamless perfectly structural material. Feasibly, with even crude teleportation tech, you could gently unbond the molecular density of a wall to reduce it to wet clay density, stir it with a wooden stick, then resolidify the wall with all molecules as dense as titanium or better. Why WELD when you could just stir or shape like clay?
