Don't use WCF for this... and I happen to have liked WCF in its time so this is not a hater telling you this.
If you have a lot of files in your MVC4 WebAPI project I'm not sure what went wrong. You don't need any /Content or /Views at all. You pretty much just need the /Controllers/MyController.cs file itself and something mapping you a route to it which should be in the default /App_Start/WebApiConfig.cs.