Dear Barksum,
My heart goes out to you. I hope you can get the attachment therapy you and your DS need. I admire you for getting that thorough assessment done. I am still writing letters to the powers-that-be to try and get attachment therapy for a child we had to disrupt our placement with, but she is much older -- your son is young enough to make fast progress I'll bet.
You probably know this but there is at least one very successful attachment therapist, Bryan Post, who travels to you home and works with you there. There's a forum of parents who've been clients of his, in case you want to check it out, at
http://groups.yahoo.com/group/illloveyouforever/
and his web site is
www.bryanpost.com, I think. It's expensive all right, but if you've hung in this far with the little guy and have got a lot of those attachment parenting skills down, I think you're doing great and hope you can get the help you need to continue somehow. Am keeping my fingers crossed for you!