Hi all,
I released the VyOS boxes on Vagrant Cloud for easy testing.
https://vagrantcloud.com/higebu/vyos-1.0.4-amd64
If you want to use it, please install Virtualbox and Vagrant and run following commands.
vagrant init higebu/vyos-1.0.4-amd64
vagrant up
vagrant ssh
And Packer templates to build it is here.
Enjoy