ToR exit node on DDWRT through AirVPN?

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I have succesfully set up DD-WRT on my Buffalo WBMR-HP-G300H using the instruction provided by AirVPN and it has been running for a couple of months now. All traffic on the network (as far as I can tell) is going through the VPN.

What I would like to do is run a ToR exit node on a pc on the network. I have tried opening 2 ports in Air (random numbers) and forwarding those ports (relay port & directory port) to the ToR pc IP address on my internal network. Is there something else I need to do? If it involves adding iptables commands then that's doable but I wouldn't know what to type!

Can anyone advise on how I go about running an exit node? Thought I might as well, seeing as it all goes throug hthe VPN anyway!