This is very close to what I do. I think of strict and warnings as part of an extended shebang line. Exporter is ugly so I avoid it wherever possible; though when I use it, I tend not to treat it and its globals specially. Finally, I reserve require solely for deferred loading of modules. So I arrive at a layout like this:

#!/usr/bin/perl
use strict;
use warnings;

package FooBar;

use Some::OO::Module ();
use Some::Function::Module qw( Func1 Func2 );

use base 'Quux';

use vars qw($VERSION);
$VERSION= 1.001;

use constant _IdNo => 0;
use constant _Name => 1;
use constant _Pos  => 2;
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Makeshifts last the longest.