SSH to VirtualBox

I had to mess with ssh into VirtualBox this morning. I need NAT on my VM so I can leverage my hosts' VPN, but I want the host to also communicate with the box. No full-on tutorial here, just some pointers to articles that helped:

• How to ssh into a guest using NAT? - a good question with a good response
• Initial Server Setup with Ubuntu 14.04 - step-by-step guide for setting up a server for ssh
• Host-Only Networking with VirtualBox - talks a bit about setting up a host-only back channel
• VirtualBox: Configuring Static IPs for VMs - finally got me into the VirtualBox network settings (and not just the individual VM network settings)

I ended up not doing the NAT port forwarding and used a second emulated network adapter to speak with the host. Seems to be working okay, although I haven't got the keys completely setup yet.