No, even if the topic we are discussing is strongly hypothetical, like space yards.
To say that we can build ships wherever we want is probably a bit of an exaggeration.
It seems that several requirements would have to be taken into account when doing so:
- Protection from Orbital/Deep Space Debris and Radiation. Smaller shipyards may not have the necessary infrastructure to protect vessels under construction and personnel assembling it.
- Logistics for Personnel and Equipment. This may depend on the distance from the supply centre.
- Equipment for Moving and Installing Large Parts. Building massive ships may involves the precise assembly of large components. Smaller shipyards may lack the specialized equipment, such as heavy-duty cranes, robotic arms, and secure mounting mechanisms, needed to move and install these large parts safely.
- In addition, ShipYards require a sizable population workforce.
So no, in my opinion the size limit for ships built in shipyards should stay as it is.