My French nationality just came through last month. I sent off the dossier June 2015, had to postpone the interview two months because of a broken foot so it was held in January. The gendarmes called me for an interview a few days later (much easier than the préfecture (Limoges) one). In about May one of my sae's came back with the sae suivi inside, no explanation.
I had started putting the application together in 2011 so used sworn translations I'd had done then, plus a couple more. When the "Projet d'état civil" form arrived from the centre in Nantes, they asked for my parents' birth and/or death certificates - I think that's for the Livret de Famille, but I hadn't needed them for the nationality.
I got the impression that working for associations is A Good Thing and helps. The Bordereau thing you just get (or I got) from the local Trésorerie. They asked for 3 years' worth but I was told that's not possible. I wrote a little noting explaining this.
At first I used the instructions from the national government site to put it together, then I checked with the Limoges préfecture site and there were some subtle differences, so I think it is worth checking both.
For any anomoly I thought needed an explanation, I just did a polite note.