Well, maybe they don't fit in so well to what we've seen. But What I'm really interested in doing is legitimately taking steps backward from the TOS Enterprise. The NX-01, while having some small nods to modern spacecraft, really doesn't seem to feel like the sort of spacecraft we'd build in the 2100's. And the TOS Enterprise is too far removed from anything we currently have to make a judgement.
So with something like this, I'm trying to push things away from the NX-01, and into the "actual future spaceship" realm, and justifying why the TOS Enterprise looks the way it does (and hopefully retroactively making it look more advanced at the same time). So I'm stealing elements from the real-world - rather than the Trek world - to do that.