Building the VSS itself is hard.
Building the VSS in ONE YEAR is even harder.
If you were to take a space shuttle (last flight 2011) to the VSS, you will need to feel about 5~10G (5~10 times stronger gravity than earth's gravity). It won't feel comfortable.
A new rocket with less 'G' should be developed for people to stay comfortable on their journy.
If we think that the VSS weighs 250 tons (nothing to do with the real thing), the launch cost on a Delta IV Heavy is 400 million per launch. The payload is about 20tons.
250/20= 13 launches = 5 Billion USD.
If they use starship, the cost per launch is 8 million. The payload is 100~150 tons.
If we count it as 100 tons, 250/100=3 launches=24 million USD.
We just have to wait.
It's 3 million to STAY, and some more million for the journy to space and back.