Basically, to be used as feeder fish for my other fishies.

Sooo.

What i'm thinking about is using a 2foot tank, with a mesh screen at the bottom, holding up two sheets of glass or perspex, and then divided so that I can get a net into the bottom of the tank to scoop out the babies.

Any ideas about how well this will / won't work?

I used to use a v trap in a 12 gallon tank, taking up about 3/4 of the tank. You can leave the females in there and net the babies at the end. I have a setup about half that size at present for line breeding. The advantages are that you are not desturbing the females or the fry until they are old enough to move. If you put the trap to one end and feed at the other they will come to the feeding end.