Congratulations! Before you know it, they'll breed in the garage, and you'll have 8 GS450's.
I would try to get the T (for Traditional or Triumph) running first. If you do, and like the E styling better, just transfer the bodywork over to the T. Easier to deal with on the paperwork, etc. It's fair to say the DMV doesn't care what tank, fenders and seat your bike has. With 70k miles, you'd have a hard time getting even $400 for the E, even if it ran like a Swiss watch, IMHO. I'd just use the E as a parts bike. How many miles on Mr. T?