I create a USB installer very easily. I just download the version of the installer I want from the App Store, then quit the installer process once it begins. Then check in the Applications folder on your Macintosh HD for the installer file. Drag the file to copy it to the USB stick icon on the desktop. To install the OS, restart the machine holding down the option key, select the USB stick as the startup disk and follow the installation instructions. No messing with Terminal required.
Guessing that the OP needs to image several computers, hence the push from a server. Unfortunately I have not bothered to keep up post Snow Leopard, so any advice I have would be very out of date. Also subject to severe memory glitches, mine not the computers.
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Bill C-51 is an act of Terrorism! It cannot be fixed and should be immediately repealed!