If you want one similar to the original, then use the rebuild (I only better compress the MZZ file for 100 MB space saving)
Now the "slim" is still the "full" framework, only that I remove setup stuff (you will find the VBS that I use to edit the MSI on the first post) and I do a admin install for better 7zip compression...this is why you see \ProgramFilesFolder and \Windows directories, you can use the VBS to slim your package and delete all setup files exept the 4.5.1 MSI and the MZZ file
I been meaning to do some videos on what methods I use to make my slim and rebuilt installers (in case I am unable to continue) but it keeps getting put off