# Build and require the subclass for this type:
	my $class = __PACKAGE__ . "::" . $opts{type};
	eval "require $class";
	if ($@) {
		Carp::carp("Part type '$opts{type}' unknown");
		return undef;
	}
	# Build the Part object template:
	my $self = {
		# name provided directly, or implicitly by type.
		name => $opts{name} // $opts{type},
	};
	# Bless into the determined subclass for this type:
	bless $self, $class;