How do I make and distribute and image to multiple macbooks?

Hello,
I am the IT support person for a number of schools. We use a mixture of Macs and PCs.
I am looking for a nice tidy option to create an image of a "master" client and distribute to a group of student Macbooks. All the Macbooks are the same model and are all running Snow Leopard (though they were released with Leopard). Initially, one of the teachers created a user account (called student) with all the software and settings that we needed, on one of them and used Migration Assistant to copy that account to the others.
I prefer to have a master image I can restore to at any time.
I figure that Disk Utility will do the job - I'm just not 100% sure of which steps to take.
So far I have created my "master" macbook that is set up just the way I want it.
Next I was going to attach it to the mac I use to run everything on (ARD etc) via firewire and boot the master in Target mode.
Then I would run Disk Utility on my mac and use the New Image button to create an image called "studentPOD.dmg" (There is room on my mac for this, or I can put it on an external USB disk)
Is this correct, and once I have the image, how do I get it onto the other Macbooks? Is there anything special I have to do to make it bootable? They all part of a student POD and can be re-imaged at anytime without worrying about losing data...so I can afford to experiment...
Any help to clarify would be much appreciated.
Also, should I look for a Snow Leopard server to do this sort of thing?
Many thanks
Suzanne

Making a Master Image on Snow Leopard - this is a bit long winded, sorry!
Build your Mac the way you want it, all updates, account settings etc, this will be your master image so don’t personalise it too much.
There are two ways to make an image with Disk Utility - they both use the Restore function.
The ideal one is to boot from Mac OS X Install DVD and go to Disk Utility.
The theoretically less ideal method is to boot from the master image itself and then go to Disk Utility.
The DVD option is theoretically better as it involves copying the master image while it is unused as opposed to the second option which copies the master image while it is in use. However, I have done this with the master image mounted and it works perfectly.
If you use the DVD method then the downside is that the Destination image size has to be the same size or bigger than the Source image size, If you use the boot from the master image method, as long as there is enough space in the Destination image to fit the files (usually around 18gb in my images) then it works. This is good because it means you can fit your master image on a small disk!
(NB this is not the case with Lion, it will not let you use the master image as a source if you have booted from it)
Ok, so you are in Disk Utility and you can see your Macintosh HD with your master image on it and you can see your USB drive with it’s empty image on it, this image has to be formatted as Mac OS Extended (Journalled). It has to be at least as big as the used space on the Macintosh HD master image.
Now you are going to use the Restore tab to restore the master image to the USB drive.
Drag and drop the Macintosh HD master image into the Source box
Click in the Destination box then drag and drop the USB image into it
Make sure the Erase Destination box is ticked.
Click Restore and when asked if you are sure click on Erase. (unless you are not sure of course!)
It might take an hour to restore, once it is finished, boot from the USB image (which will now be named the same as your master image) and make sure it is what you were expecting, test it etc. I usually rename it at this point to something other than Macintosh HD, this can be done by right clicking on the disk in finder and renaming it.
Restoring from a disk image:
On the Mac that you want to re-image with the master image:
Plug in USB drive containing your master image (created above)
Boot from Max OS X Install DVD and go to disk utility from the Utilities menu (you will need to go through the “use English as the main language bit” first.
Disk Utility might take a while to find all the disks / images…
Highlight Macintosh HD (or whatever the image name on the Mac you are about to re-image is)
Click on the Restore tab
Drag and drop the master image into the Source box.
Click in the Destination box and then drag and drop the Macintosh HD image into it.
You should have master image in the source box and Macintosh HD image in the destination box. The erase destination box should be ticked.
Check everything is how you want it and click on the Restore button.
It will ask you if you’re sure – if you are then click Erase – if you’re not then click cancel and go play with a PC!
It will tell you how long it’s going to take, mine take around 45 mins.
Once it's finished boot from it and bob's your uncle!

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