I did some experimenting with App::cpanminus. I took a cpan script and used cpanm. The script fetchs and installs App::cpanminus, and then it installs all the prerequisites for Moose and Moose itself without the need for cpan. Warning: take a coffee break while Moose installs if you choose to try it:).

#!/usr/bin/perl

use strict;
use warnings;

system("curl -L  http://cpanmin.us |  perl - App::cpanminus");

exec( "cpanm",
"namespace::clean",
"namespace::autoclean",
"Class::MOP",
"Eval::Closure",
"Declare::Constraints::Simple",
"Package::DeprecationManager",
"Sub::Name",
"Test::Fatal",
"Dist::CheckConflicts",
"Data::OptList",
"Devel::GlobalDestruction",
"List::MoreUtils",
"MRO::Compat",
"Params::Util",
"Scalar::Util",
"Sub::Exporter",
"Task::Weaken",
"Moose",
"MooseX::Role::WithOverloading",
"Package::Stash::XS",
"Package::Stash");
[download]

Note: you might need to use --sudo