Welcome matt_gti! There are a few of us fellow engineers on the board! I'm a Mech E by degree, but Plumbing Engineer by profession. Should have taken the FE back in school like everyone else said to, but had different plans for the future back then. Will likely try to get the FE out of the way perhaps later next year, with the PE in 2013 (?).
Like you, I also enjoy the design side of things. I'm hoping to pull the plug in my mid 40s or so....but currently single, so the unknown future with a wife and kid(s) could adjust those plans slightly.