No, we're going to use the 'natural' order of the files. The OS isn't necessarily first. I wouldn't worry about it - your Fusion drive will eventually figure it out.
If you want to "force" the OS first (which won't guarantee its placement on the Fusion drive), install it to the drive, then migrate from the backup during the first boot (see the "I've got a new Mac..." FAQ).
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--Dave Nanian
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