Short answer: No, I'm not. However I know Mono.Nat because I am evolving it in my own fork called Open.NAT. It has a lots of improvements, fixes and features that you had to develop by yourself  but sadly you cannot use it because it requires .NET 4.5. 
If in the future you change the framework target I will make a pull request for you evaluation. I am working hard on Open.NAT and I would love to see it in OpenRA but that is not possible yet.