PK, there really is nothing wrong with useing a breeder net. I used one for a long time before I realized that I couldn't get rid of the fry fast enough to keep up with the females.
Good idea on putting the mother in another net to give her a rest. She will need all the rest she can get before those males get a hold over her again (or at least try to). I think that the 10 gallon fry tank is a good idea. Just watch out that you don't have a huge difference with fry later on down the road. The larger fry tend to pick on the newborns and will in fact peck them to death.
Dogartist, birthing can take up to 24 hours and it can be really hard to tell when she is done having fry because she might still have a gravid spot. PK Tester was right on with the female looking much smaller when she is done.
Good luck both of you on your fry!!
-Jim