multiple VNC servers behind ICS

Is it possible to configure ICS to support multiple VNC servers running on
pc's assigned 192.168.0.1 and 192.168.0.2?

I can access a VNC server on 192.168.0.1 (the ICS Host) using standard port
5900 fine.

On the 192.168.0.2 pc, I've configured its VNC server to use port 5905.

I've looked into the ICS Configuration Utility, and set "Target to:
192.168.0.2" for port 5905. But that doesn't seem to work. I tried "Target
ICS Server", but that doesn't work either.

Is this senario even possible? I would like to be able to reach the VNC
Server on 192.168.0.2 via a remote pc out on the internet.