What is the layout of the orchestra?

In front of the Orchestra stands the conductor with his back towards the audience.
On the left the first violinists ( under management of a concertmaster )
The second violinists are seated next to the first violinists.
The alt violinists are seated mid-centre with the cellists next to them to the right.
The contra-basses are seated behind the cellists.
Behind the alt violinists are the flutes and the piccolo with next to them hobo's and althobo. Behind them the clarinets and bass clarinets. Next to the bass clarinets the bassoons and contra bassoons. Behind them the brass section with the horns in the left, trumpets, trombones and tuba next to them.
Completely to the back of the Orchestra the percussion section with kettledrums glockenspiel and to the far left the harps.

In case of a pianist, he or she is to be seated left of the conductor

A big Symphony Orchestra consists most likely out of :
20 first violinists
18 second violinists
14 alt violinists
12 cellists
10 contrabasses
2 harps
2 kettledrums
6 percussionists
6 horns
5 trumpets
4 trombones
2 tubas
1 sax
5 bassoons
5 clarinets
5 hobos
5 German flutes and most likely they can play the piccolo when necessary