$big_foo_bucket->{camshaft}   = $other_foo_bucket{camshaft};
$big_foo_bucket->{gearbox}    = $other_foo_bucket{gearbox1};
$big_foo_bucket->{drivetrain} = $other_foo_bucket{the_drivetrain};
$big_foo_bucket->{smokestack} = $other_foo_bucket{my_smokestack};
$big_foo_bucket->{junkyard}   = $other_foo_bucket{_junkyard};