I'm an IT student and I want to create a Multiboot USB drive with everything one may need when diagnosing and installing windows.

So, I went ahead and downloaded the ISO-s, and merged them all into one big ISO file.
BUT, I want for the installer to automatically install apps I have put on the USB, and not only that, I want it to do it automatically without my intervension, and I want it to mount my driver pack and start scanning for drivers automatically.
I do not want for the setup to download anything, I want it just to install as if there was no internet connection. I can easily update and activate Windows later.

I have created a separate Office 2016 installer with only one language that I require.
I want it to be installed after the OS installation has been completed.