Combining these thoughts ... here's my hypothesis.
1. The game checks to see that you have Apollo Program built *somewhere* in your empire, before allowing any spaceship parts to be built.
2. The partially completed spaceship resides, is stored, at your current capital.
If true, this would give the player options:
- Conquer the enemy capital, destroying the partially completed spaceship. The AI could begin constructing a new spaceship from scratch, requiring many more turns. The new spaceship would be housed in their new capital, as its parts are built.
- Conquer the enemy city that houses their Apollo Program. The AI would have to construct another Apollo somewhere to build the last few spaceship parts
- If the AI happened to build its Apollo in the capital, then conquering the AI capital (or destroying it) would achieve a double goal -- destroy the current partial ship and prevent the AI from starting on the other parts.
If item 1 above is not quite true -- perhaps building Apollo anywhere once sets a flag to enable construction of parts for that civ -- then it matters less whether the city containing Apollo survives or not. Consider the case of nukes: as long as any player, from any civ, has built Manhattan Project, then nukes are allowed. I don't think that razing the city where Manhattan was built will make nuclear weapons un-buildable.
1. The game checks to see that you have Apollo Program built *somewhere* in your empire, before allowing any spaceship parts to be built.
2. The partially completed spaceship resides, is stored, at your current capital.
If true, this would give the player options:
- Conquer the enemy capital, destroying the partially completed spaceship. The AI could begin constructing a new spaceship from scratch, requiring many more turns. The new spaceship would be housed in their new capital, as its parts are built.
- Conquer the enemy city that houses their Apollo Program. The AI would have to construct another Apollo somewhere to build the last few spaceship parts
- If the AI happened to build its Apollo in the capital, then conquering the AI capital (or destroying it) would achieve a double goal -- destroy the current partial ship and prevent the AI from starting on the other parts.
If item 1 above is not quite true -- perhaps building Apollo anywhere once sets a flag to enable construction of parts for that civ -- then it matters less whether the city containing Apollo survives or not. Consider the case of nukes: as long as any player, from any civ, has built Manhattan Project, then nukes are allowed. I don't think that razing the city where Manhattan was built will make nuclear weapons un-buildable.