I downloaded your Beta 13, and opened the test map in UnrealEd. Through the class browser, I found the ONSJ6Bulldog and went to it's default properties. Then I went to the mesh and skins, and for each one I went to the approapriate mesh and/or skin, selected it, and hit "use" in the defaultproperties. Then I went to the texture browser, selected the bulldogj6 package, and hit save. After saving, it worked in game without the missing external packages.
Why do you want to have them all in the same package?