OEM Install of Ubuntu Server [14.04.3]

I am trying to do an OEM install of Ubuntu Server (14.04.3) but cannot seem to get it working. I have managed to do a Ubuntu Desktop (14.04.3) easily.

Why?

I am trying to this to:

1. Install all current updates


2. Install open-vm-tools, sssd and other packages



3. "install" some in house scripts


4. Put the initial config in for SSSD, so a custom "join-domain" script can be run which just does the final steps to test and join the domain once deployed.


5. Have a consistent base build which can be used for VM Servers.

Can someone please point me at a step by step guide to achieve this similar to the one for Desktop OEM Installation.

Many Thanks for your help on this.

UPDATE 2015-01-18: Adding step by step of what I have tried:

I tried to add images properly but I'm not allowed to, very unhelpful!!!

I have tried this:

1. Select OEM Install (for manufacturers) from installation media boot menu (Screenshot: i.stack.imgur.com/tg5WX.png)


2. Install Ubuntu Server as normal (Screenshot: i.stack.imgur.com/l4pgz.png)


3. Install Additional Packages (Screenshot: i.stack.imgur.com/me1t2.png)


4. Initial config of packages



5. Try and run oem-config-prepare (Screenshot: i.stack.imgur.com/RNHM8.png)
   ERROR MESSAGE
   The program 'oem-config-prepare' is currently not installed. You can install it by typing:
   sudo apt-get install oem-config

Please advise what I am doing wrong?