Those aren't your tanks in his commission post is it?
His profile lists a few "Friends" I would see about contacting them, to see if they know him personally. He does list one member as someone he knows outside of DakkaDakka.
From there, I would see about getting a phone number. Do you know if he is an adult? If not, I would see if getting his phone number and placing a call to his house will help. Even if you have an address you can use a reverse look up to get his home number.
His commission service seems relatively new, and you may be his only customer. The website looks like it was put together around mid-August, so he does not really have any credible feedback either. If the phone number fails, I would see about calling local hobby stores and asking about him (that is if you have his first name). Hopefully you can stir something up that will make him come out of hiding.
I also found that he has a Rogue Trader profile as well, maybe that will help.
Goodluck to you sir! I hope everything is resolved.
Profile shows he was last on 12/23/10. So he has definitely been around, no excuses there. He also has a Steam account but I do not think that will help you.
I also have the individual's full name, as well as a facebook profile, as well as a possble home address/phone number. Let me know if any of that can be useful to you sir.
Also he placed 2nd place GW
2010 'Ard Boyz Tournament at his local gaming shop.