I've tried doing this before, but I always end up in a confused mess. Is there a simple way to do this?
^it really is alot easier to memorize the notes on the fret board, memorize your scale intervals then just pick your key and scale and you're set!
I would just recommend learning the notes in the scale instead of relying on patterns. Patterns aren't bad though, they help with on-the-spot sclae playing, but if you know the notes in the scale and the fretboard, you can make your own patterns on the guitar.