[Jasen]

Sounds like a neat project, but as others have said, I don't see the eco gain.
With that trans axle your basically rear engine. You'll need to tweak the braking proportion, re tune the suspension, maybe add some rear roll control. Are you going to keep the radiator up front? your adding how much weight with long rad hoses/pipes, plus how to run them where they wont get damaged and how many more gals of coolant, water weighs 8+ lbs a gallon. You'll need to tweak the braking proportion.

But it does still sound like a neat project.