I'm planning on getting fallout 3 for my computer Is there a way to get master chief armor, and/or become taller without being 100ft tall?

Yes, and yes. The former you'll have to search fallout3nexus.com for, the latter is the command "player.setscale [scale]"

Thank you, I'll check Fo3 nexus:)

There is a limit how big you can become with the setscale command, though. I played around with it once, and i think the limit was 5 (times bigger than normal). I wanted to be as big as the Washington monument, alas it's impossible

you can get pretty big if you use a combination of race height and setscale.

apparently you can edit setscale through a hexeditor to bypass setscale restrictions. this was done in oblivion, and some russian guy did it for fallout.