I have to echo and expand on what AKAmra said. IMO, it would be a terrible mistake to take the same approach to Traveller PD that has been taken with other PD systems. If the parties involved want it to live up to their expectations and those of the potential audience, the releases must be Traveller RPG supplement first, with the PD/SFU setting as a secondary concern. That means Traveller compatible rules for starships and starship combat within a roleplaying environment; the Traveller character generation system; worlds, equipment and economics based on Traveller.
If a T:PD book is released that refers players to pull out SFB or ACTA-SFB to handle starships and starship combat, I predict this line will die a quick and painful death. Such an approach will appeal primarily to a few SFU fans who are curious about Traveller; but I can't imagine it bringing many of those who are primarily roleplayers to either the SFU or Traveller, and I don't think it will fly with those already playing Traveller.
I would suggest, rather, that "all" Mike West has to do is take MGT and then insert the SFU fluff, not the other way around. I'm not trying to undermine what Steve said, but I think it's an important distinction if, again, it is to live up to everyone's expectations.
A combat system? Why? You have your choice of SFB, FC, Armada, and, soon enough, ACTA. Why would yet another combat system be needed?
Wow. No, just no. I don't currently pull out "Mayday" or "Power Projection" for Traveller starship combat (though I play both games). I haven't made an effort to adapt ACTA to Traveller (has anyone?) We don't need "another combat system". We have one. It's called Traveller. See page 146, add SFU fluff as appropriate. We don't need to design the Enterprise using High Guard. See page 105, or prospose an alternate system.
Traveller is the game and the system. PD is the brand. SFU is the setting. If, I believe, you really want to expand the audience, and tap into the MGT customer base. I think that it would be a misunderstanding to think that an SFU line published by Mongoose is an automatic home run for everyone. If it's just some Traveller elements copy/pasted over PD D20M/GURPS mechanics, I find it hard to believe that the result will be a workable PD or
Traveller game (and I hope those involved are planning playtesting and feedback to verify that).
All just my opinion.
(daryen, OOC, are you Mike West?)