2nd edition codex, and 3rd edition codex has some pictures of inside craftworlds 
Thanks for the piccies--very much appreciated, especially when one considers that I've primarily been into the RPG side of things for the past 30 years. (The start date is basically marked by my ending of playing wargames... O.o )
Generally avoid right angles, and use curves and pointy angles instead...
Of course. The kind of things that are more difficult to model (at least for me). I can see why the Imperium gets a lot of love in this regard!
You can look up Protoss buildings in Starcraft too, their visual design is pretty similar to Craftworld Eldar.
I had heard about some of the similarities but have never really looked into it. Clearly I should have done that because, at least in my mind, you're 100% right. Great recommendation!
Here are some images of craftworlds for inspiration!
That third one is
sweet! It's like the Eldar had a baby with Darth Vader's doomed super star destroyer,
Executor...

The craftworld image kind of reminds me of when the
Executor crashed into the Death Star.

I like your ideas for craftworld architecture. I think you're on the right path.
Thank you. For what it is worth, the hexagonal structure is in part there to take into account the "domed" sections, too. The idea being that each "honeycomb" was, in essence, its own form of "dome" that could be filled with whatever environment the Eldar wanted, with the interstices between them being for utilities, transportation etc.
It also helps that the honeycomb/hexagon is strong and very "nature" (as it were).
As an example, my brain was going to the idea that if you looked closely at Eldar materials, you'd probably see tracings of honeycombs. Wraithbone is based upon a similar structure, akin to trabecular bone in mammals.
Question: Would the hexacomb approach fit with the domes? Or, like fractals, they're just the shapes around and a more traditional dome be at play? Maybe a bucky ball dome but akin to the glass structure in the British Museum?
We also see pyramids quite a bit (hopefully not too inspired by the Necrons!).
The more ideas the merrier!