Error adding second Project in an existing Solution.

I want to build 2 separate applications that share a common code base - and build each for Android, iOs, Windows.

Here's the Solution setup I have in mind ...
MyApp (Portable)
MyApp.Application1 (Portable)
MyApp.Application1.Droid
MyApp.Application1.iOS
MyApp.Application1.UWP
MyApp.Application1.Windows
MyApp.Application1.WinPhone
MyApp.Application2 (Portable)
MyApp.Application2.Droid
MyApp.Application2.iOS
MyApp.Application2.UWP
MyApp.Application2.Windows
MyApp.Application2.WinPhone

I start by creating a new project Class Library (Xamarin.Forms) and name it MyApp.
I then Add->New Project Blank Xaml App (Xamarin.Forms Portable) and name it MyApp.Application1
When I try to Add->New Project Blank Xaml App (Xamarin.Forms Portable) and name it MyApp.Application2, there is an error when generating the Application2.iOS saying something about another project of the same name exists.
In the end, MyApp.Application2.iOS is missing.

Am I going about this the wrong way?