You got the skills..........
Andy,
You certainly have the skills at becomming a great product designer/illustrator. Too bad consumer products are slowly being designed overseas. Engineering is the next to go. Your illustrating skills could still have a future as most American companies contract out the designs after illustrating what it is they want. Example, Kodak no longer designs cameras in the US. They have a group of marketing types that work with a Chinese company who designs and builds the cameras. Kodak uses illustrations to show the styling and features it wants.
Keep it up, with skills like that you are bound to go places.
Joe