[Q]

The most economic way is to use one or several space yard ships to construct first space yard bases in the sector of the star. I use spacestations with just the space yard and no further unnecessary components. 11 bases for a ring world; 21 for a sphereworld. Bases have lower maintenance costs than ships! As soon as possible you choose one space yard to start with the construction of the ringword/sphereworld placement generator. This component takes twice the construction time than the planetary gravity plating and the hyper density cables. Once the remaining construction time of the placement generator is equal to the construction time of the platings and cables you start to construct simultaneously 5 each of the platings and cables for the ringworld and 10 each for the sphereworld.
This gives you the complete construction of all needed components at the same time, which is essential. Otherwise your empire might go bankrupt due to the astronomic maintenance cost of the constructed but not yet used bases with the components for the sphere-/ringworld!
And Last but not least have a rock colony ship and population transport ready for the new ringword/sphereworld!


[This message has been edited by Q (edited 03 May 2001).]