I am not seeing how you put that together from anything I wrote. You suggested $1 trillion. There are many versions of experiments demonstrating oxygen extraction from moon rock. Here is one article. At 10W/kg you need 450 kg of solar panels. Proof of concept would be to launch a little bit of oxygen from the moon. That should be closer to the billion dollar price range, less if it is attached to some other project. Producing a 8.6 x 109 kg of LOx and launching it would require a lot of infrastructure. Oxygen needs to be delivered to L1 for around than $10 per kg. Where are the parts, fuel, and equipment coming from? If all of it comes from Earth then why not launch an assembled ship? The plan according to spacex is to refuel the spacecraft while orbiting earth. For one trip to Mars there will be around 8 launches of the BFR. 1 launch for the spacecraft and 5 fuel launches. The BFR to mars uses 1100 tons of propellant (CH4, O2), 250 tons cargo(150 tons reusable), 85 tons spaceship. The propellant is 78% oxygen. There is no reason we could not break that down into 1 spacecraft, 1 methane launch, 1 mixed fuel, and 5 oxygen deliveries. If you have Oxygen in space it can easily cut out half of the launches to LEO. If you are going to Mars you need to have well developed radiation shields that do not depend on Earth. On the moon shielding is easy. Pile lunar regolith on top of the habitat modules, build with heavy masonry, or live underground. Earth's magnetic field does not protect against x-rays, gamma rays, meteoroids, or neutral particles.