Although I have been building track in OO Gauge using Code 100 rail, my technique has been to use a 40 watt soldering iron as anything lower than 40 watt will not melt the solder properly to make a good join between the copperclad and the rail.
My experience is purely limited to building just straight and curved pieces but they have been built by the process you are looking at using on your turnouts.
The main thing to remember is that the copperclad sleepers need a small gap cut roughly halfway between the rails to prevent shorting out the power, however, with turnouts there are several places where mulitple gaps will be needed to prevent shorting out the power.
I have attempted to convert peco points to copperclad sleepers with little success so I did a serach on youtube and found the channel called fast tracks tools where the commentator talks about building straight and curved pieces in 1 video but he has also done a series of 12 step by step videos on building a turnout.
The step by step videos are very useful for building turnouts and can be applied to building left and right hand turnouts.
I can fully recommend watching these videos.