That and unless you've got really good space yard ability it's going to take at least 45 turns to complete the generator. Which is probably why some of us wanted the ability to let space yards pool their resources together.
IIRC, a ringworld/sphereworld already there will keep the star from exploding. But I'm not completely sure about that.
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"What do -you- want?" "I'd like to live -just- long enough to be there when they cut off your head and stick it on a pike as a warning to the next ten generations that some favors come with too high a price. I would look up into your lifeless eyes and wave like this..." *waggle* "...can you and your associates arrange that for me, Mr. Morden?"