[dogscoff]

I actually began the proportions ringworld+cultural centre project in a single player game earlier in the year. The game crashes now when \i try to process the turn, but after dumping almost 2billion population on there I had the construction time down to 683 turns. Of course with more population (At least another 5 bllion available on my own homeworld and captured homeworlds) that figure would have dropped more rapidly as I hit the bonus thresholds.

I was transporting pop, by the way, with a fleet of starliner-sphereworlds, capable of shifting 20million ppl each.

But that game's broke. So I started a new one=-)