[GeronL]

That last link I posted is very good. Its in 2 parts.

You'll want to save it and read them offline.

[LibWhacker]

I'll check them out, thanks! I've never heard of another scheme that would allow us to build really large ships on Earth and lift off into space with them. That's why I've always preferred Orion. I just can't imagine building a large well-shielded ship in orbit or on the Moon with present technology. Still, I'm always interested in ANY idea. Anything is better than nothing, as long as we get moving on it, that's for sure! And we've been spinning our wheels a lot the last 30 years or so, imo, so I'm ready to get moving. :-)