I just checked out "the" thread Khaos... Awesome stuff! I don't know what was more incredible - the immense tank build, the surgery, or the complications to surgery. Wow.
I'm afraid I gave up on reading the entire thread (got some pretty sideways looks from my girl after a couple of hours on the computer), but I read up to about page 25 before beginning to skim for yours or Tink's posts.
How far along is the tank project? It's too damn cool. Of course, you know that already - it looks like the whole world's already told you that.
Love your style, my friend.
Check with the docs and DAN for an "okay" on diving... But if you ask me, I don't see anything that should prevent you from diving. Sure, it looks like you're going to have to keep your physical strain to a minimum, so it'd probably be best to don and doff in the water, and have someone carry your gear for you. But I suspect that diving would actually be GOOD for you, otherwise... A good, low-impact activity combined with slightly raised PPO2 levels that would actually promote healing, if anything. The blood thinners may actually help you offgas better, too... At least, in theory.
The drugs that they probably still have you on may have some bad side effects, though... Underwater, you need to be able to think and act clearly - are you capable of driving? Do you believe that you're able to make rational decisions underwater?
Have all of your wounds closed? Historically, salt water is good for wound care, but there may be some concern about your body's natural armor having a "chink" in it.