Well idk what bas's qualifications are, but their plan can work. They have set 6 billion as the required funds, relatively cheap by space standards and it's all based on technology available now, with plenty of margins. Their funding scheme is a bit risky, but in 2 days they had 33000 volunteers, all paying an application fee. Their intent to broadcast selection and what not could very well work. If they actually get the money, biggest if, it could easily work.
they aren't coming back...they don't need the muscle and bone density to survive 1g. Not sure what you're talking about.....