Battery relocation- is it possible to just use "remote battery posts" in the engine bay?

LOL ... That chassis ground better be "reliable" LOL or your cars going to break in half LOL.. I would venture to say that that's pretty solid from front to back.... Personally I don't know anybody who's ran two cables...

Ok. Fair point! :D
Never really thought about the quality of the electrical connection through the whole body of the car.