.net 4.5.2 will be avalible for WSUS on 13 jan 2015. See …

I have already build .net 4.5.2 into my custom base image along with Visual C++  :

Download .net 4.5.2 offline installer from link…

Create a Application into your Build and Capture environment.

Application naming

Point to your source files

Set a destination name

Enter the silent install command for .net 4.5.2 : NDP452-KB2901907-x86-x64-AllOS-ENU.exe /passive /norestart

Create the application

Go to you “Build and Capture” Task Sequence and enter the application just created and a restart action just after