Packer script for creating a golden image with latest nodejs(but configurable using "n"), npm and nginx

Nodejs and Nginx Packer Script AMI

{
  "variables": {
    "aws_access_key": "",
    "aws_secret_key": ""
    },
    "builders": [{
      "type": "amazon-ebs",
      "access_key": "{{user `aws_access_key`}}",
      "secret_key": "{{user `aws_secret_key`}}",
      "region": "eu-west-1",
      "source_ami": "ami-9d23aeea",
      "instance_type": "t2.micro",
      "ssh_username": "ec2-user",
      "ami_name": "nodejs-latest-amazon {{timestamp}}"
      }],
      "provisioners": [
      {
        "type": "shell",
        "inline": [
        "sudo yum -y update",
        "sudo yum -y install gcc-c++ make",
        "sudo yum -y install openssl-devel",
        "sudo yum -y install git",
        "sudo yum -y install nginx",
        "git clone git://github.com/joyent/node.git ~/node",
        "cd ~/node",
        "git checkout v0.10.37",
        "./configure",
        "make",
        "sudo make install",
        "node -v",
        "git clone https://github.com/npm/npm.git ~/npm",
        "cd ~/npm",
        "git checkout v2.7.1",
        "sudo make install",
        "npm -v",
        "sudo npm install -g pm2 gulp nodemon forever bower n"     

        ]
      }
      ]
    }

Wouldn't using nvm or n or similar solutions would be preferable then reinventing the wheel?