I asked a question on the arrangement of the string parts in Music Fans recently: Question in Music Fans.
I asked there since the question was inspired by a particular performance of a particular piece: Beethoven's Eroica by the CBSO. I received one excellent answer there which included a link to a very interesting paper.
However, the question is larger than just that one piece and it was suggested that I try here as well.
One surprising thing that I have already learned is that what I previously regarded as the normal arrangement, second violins behind the first, is relatively new. So, one of my questions, whether Beethoven specified the antiphonal arrangement is moot: he probably didn't since that was normal practice at the time.
I have seen plenty of information on how the composition of the orchestra has developed but less on its arrangement.
What is known of the development of the arrangement of the orchestra? For example, was it standardised in Mozart's time, subject to the conductor's whim per performance, ...