I have no experience with WE-CIM. I will say I have never had much luck with raster to vector software. There are to many variables. Software can take out some of the stuff you don't want and also take out the stuff you do want. I have found it easier to just trace it with a cad program. That said. There used to be a free raster to vector program. I forget the name maybe try google for "raster to vector".