any of the above is possible...start using the search function at the top of the screen...if you read what others have done you can have a better underestanding of what works and what doesnt work...using the search with advanced settings searching in just the title of armor builds and such
what do you know how to work with? sheet metal can be awesome looking if you know how to work it. if you don't, it looks like a ffolded piece of sheet metal
use your strengths. if you don't know how to work with any materials, expect to spend time on it and goof up a bunch of times.