There are lots of books, but less online tutorials for knitting a sweater. Did you search? Here's a few more ideas..no idea if they are bottom up or top down, but generally if you're creating your own you do what you want.
http://www.knitty.com/ISSUEwinter04/...bynumbers.html
Pattern Generators -
http://www.thedietdiary.com/knittingfiend/index.html