Take a look at pictures if the giant redwoods in California - that will help you decide!

Am east facing window is best as that gives light but not too much direct one.

Why not start it off as a Bonsai? I feel it should be outside. I like to think of this truly massive tree in a little pot......trained to perfection over say 20 years. I'm too old to do a long term Bonsai but I have other less majestic flora doing reasonably well.