D20 Modern, Star Wars Revised, Traveller D20, and Spycraft: How do I mash them?

[Magius del Cotto]

As the title says, I'm thinking of running a D20 Modern/Spycraft/Traveller20/Star Wars Revised campaign with, maybe, a bit of Call of Cthulhu or Dragonstar thrown in, possibly with cameos from my collection of monsters and various fantasy books. My question is, what sorts of campaigns should I try to make with all this stuff (remember about Traveller's world creation rules), and which rules should I go with for this monstrosity of a rules set?
I shall leave you to fry your brains.

 

[Visceris]

Before you start I suggest you get drunk first, and eat peanuts.

 

[PosterBoy]

Of those, I think T20 is going to be the hardest to integrate. It's varies in many different areas, especially combat.

But the others I think are pretty compatible. Even T20 has a lot of stuff that you can use without mods, but their vehicles and combat might require some work...

 

[Magius del Cotto]

Before you start I suggest you get drunk first, and eat peanuts.

Considering some of the projects I've tried taking on previously (one being an entirely underground C&C Renegade map that I never finished), I don't think that would help much.
Also, the Traveller creation systems (world and universe, at least) will be easy to port, as will the Prior History thing (the biggest thing I think I'll be porting over). I'll probably yoink the chase rules and the action die from Spycraft, the vehicle combat from Star Wars, and the Allegiance system from D20 modern. Not sure if I'll go with HP, VP/WP, or Stamina/Lifeblood (though I'd propably crazy if I tried to. Not that I'm not already...), but that still leaves a lot of mixing to do, and, for most of it, I need ideas for what kinds of campaigns would be good. Any ideas for this would definitely be much appreciated...