fixing old wiring in 40's bulit home with rock lath
I am planning on redoing a lot of wiring ( just had the old insulation containing asbestos removed and found boxes that had been covered over in the attic with bad splices, etc.) and feel I will need to cut into my walls. I did a little work when we first bought the house (added a 20 amp gfci, so my wife could dry her hair, etc.) but am now hoping to fix all the electrical issues we have ( none working lights, outlets, etc.)
From my earlier work I know we have Rock Lath covered with Plaster. So my question is, if I cut to the studs and then nail the pieces of rock lath and plaster back how do I fill in the seams? Also does this sound like it will work? I have done it with drywall, but wasn't sure about Rock Lath.
I have seen much on the web about doing this so any advice from someone who has done it would be appreciated. Thanks.