The hood on the S5 is essentially a mix of ingredients from a Trad nine stud and a camping tent. I watched two factory elder statesmen put one up at Shelsley and it would have made a good comedy U tube clip. I have no problem with the hood, but I really don't like the lack of elbow room, and the long stretch to the pedals.
The forward rear axle position was the default trad position until 2006. Not sure from when.
Since the Aero rear axle is mounted on a subframe, I would think that this is a simple matter of subframe mounting position. If the holes are predrilled using a template, they should all be the same.