Yes, thanks - that's essentially what I used.
However, I updated the firmware from 36698 to 37305 and things got really wonky.
Below is more details, but essentially with 37305 once I get openvpn working, any change I make kills it (even simply hitting apply-changes kills it).
after I updated from 36698 to dd-wrt 37305 things got strange
I restore the backup that I made in 36698 that doesn't include OpenVPN. Everything is working (dns, etc)
I go thru the steps of configuring OpenVPN
I reboot the router (OpenVPN working)
I backup the settings.
I make no changes, simply hit "Apply Changes" and OpenVPN is not running (no log or status in Status->OpenVPN) and I can no longer get to my upstream router, although the router does obtain a dhcp release from the upstream router. (I have not yet enabled any script at the firewall)
So I restore the settings after I got openvpn working, and ... Still doesn't work.
I must go back to the settings I saved in 36698, then re-configure everything or restore the 'open vpn working' backup)
(But even then, if I make any changes after I get openvpn working, the router essentially stops working)
I'm going to go back to 36698 and hope that it's not a hardware problem causing this...