Booting from disk image of iMac, off external, w/ MacBook..am I the 1st ?

Hi there,
I'm currently between iMacs. Apple is graciously replacing my troubled early `06 / 20" Intel iMac ( which I FedEx'd out on 3/1/07 ) w/ a current model ( which is in the brink of shipping to me ). This one I've upgraded to 24 " / 750 GB on the HD.
In the meantime, The LaCie external that I've been cloning to for months is what I'm currently booting from w/ my Intel MacBook.
All 3rd party apps seem flawless, aside from slower processing of course.
But the Apple Tech I was just on w/ for 90 min. had not heard of this particular useage , and certainly couldn't troubleshoot possible results when i bring the user folder over to the new iMac.
Have been an uninformed dunderhead here ?, or as anyone else done the same. . . .similar even !?
_TIA_
~~~=Dave

Hi DmR of AtoZ,
the scenario of using the migration manager to transfer your data and applications from the external firewire drive to the new hard disk DOES work perfectly - I did it several times. However, it will only work if you have a bootable system on that external drive (which you do if I understood your previous posts).
The "drag&drop" approach does NOT work unless you move every single document. You CANNOT transfer a user folder by drag&drop (in fact you can but it is an extremely complicated procedure that involves lots of hacking in Terminal).

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