I run two PBEM games (which is really the same game, but the two groups havent met yet in the campaign) and both have T20 specific characters in them that used a slightly modified system and basically OTU background. About 4 years ago or so I opened the Pirate part up to all Traveller character types, but all of the Solomani group are T20/d20 future characters.
I use the two track Damage system, because people still like to accumulate HP, but I just call it "Stun/Kill" to save me some writers cramp. "Lifeblood" sounds wierd to me.
When I plan for this game, I plan it in T20/d20 terms, which is great because there is tons of material and online generators and whatnot.