I still get an uninitialized variable for my @hashData.

Then it seems obvious that you're not loading a value with this line:

my @hashData  = $hash{Scope}{model};

Side note: This should probably read more like:

my @hashData  = @$hash{Scope}{model};

Never assume there is data where you expect it to be when it is coming from an outside source. Check it first. For example:

my @hashData  = ();
if (!defined $hash{Scope}{model}) {
    print "Scope and model missing!\n";
} else {
    @hashData = @$hash{Scope}{model};
}
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...or something of that ilk.