Using this Geometric Network Utility SOE Rest project and VS 2015 I am able to build the project and eventually I am getting following dlls at
..\Documents\Visual Studio 2015\Projects\SOE\ByPhaseGeometricNetworkUtility\obj\Debug

and in
..\Documents\Visual Studio 2015\Projects\SOE\ByPhaseGeometricNetworkUtility\bin\Debug

can you please let me know how to get/create .soe file now?