This looks pretty slick... like a number of others here, I think that the "mirror" engines look better than the "Akira-style" ones (note - NOT "Akira-rip-off!). On the other hand, I also like the idea that the Titan nacelles were probably designed based on the same root design as Akira's, maybe even manufactured in the same factory.
Which brings to mind... in this "Alternate-Alternate Universe," we'd probably see an Akira-class there as well, and that Akira classes engines would probably be made at the same facilty as your mirror-Titan's engines would have been.
Anyone feel like doing a quick-and-dirty Akira-with-these-engines image? I get the impression that this would improve the Akira as well...
Oh, and I like the smaller ship you did as well... what, exactly, is the role of the Aries intended to be?