What's the purpose of that?Our first step will be to colonize this solar system to whatever extent is possible.
On SciFi right now is a very good show called The Expanse. I believe this is our future, not extra solar planets.
Our first step is colonize Mars. Much closer to the meteor belt where we can get all the steel and iron we need to build a planet size spaceship.
When the sun burns out doesn't everything in our solar system? I know earth it pulverized. So we need to get to a younger star. Most important is it blowing up soon? Second is their a planet we can live on.
And if it's going to take 80,000 years we should send those iPad size spacebots on sails to the planets we want to live on. Plant the seeds of life
The ship we are on its so big it may as well be a planet. There would be no need to ever leave it. Our planet will die but we don't have to.
Mars is in our solar system, that's what I mean.
The sun won't burn out for millions of years. We have time.