Getting modern .NET Core projects to work in old man Visual Studio 2015.

I've downloaded the 4.7 .NET Framework and .NET Core 1.1 and I have Update 3 so what gives? Why can't Visual Studio make sense of a UI project?

• get "NET Core tools Preview 2 for Visual Studio 2015" from here
• install the missing .NET Core 1.0.1 SDK 1.0.0 Preview from here