What I would like to have seen on the ERA would have been a bit lower battery location more like the originals and then the solenoid could have been mounted per original on the rear of the wheel well. Also it would have put the weight of the battery down a bit lower. But I understand the difficulty that creates with most people installing SC side exhaust and the cost advantage of using the same header ends for the street undercar exhaust - just not enough room.
But if someone, someday takes on building another street roadster from ERA and wants to look at fabricating some block hugging headers for it, modifying the battery box bracket to shorten it looks like a pretty simple task. It would be a task customizing header to clear a lower box - just not much room to work with due to the rise of the main frame rails.