Design as a whole looks great
My only critique is that the detail level seems a bit light for the size.
It's not feeling huge- rather it feels like a smaller ship that's been blown up quite a bit.
I think it needs a pixel-paint pass over all of the major surfaces, adding small greebles and lights to make the scale really feel right.
Different building technique then are humans using, actually those greebles, connected parts are structural weaknesses, try find something for example about Germans attempt to build tank with top armor from pretty much one piece, ofc it didn´t worked coz of weight, but that isn´t issue in space. Also I am afraid it would be actually too chaotic, tested it, I can find my test branch some where maybe.. anyway, noted.
Looking at it.. I am starting to hate those lights on engines.. ou well, back to photoshop, this one needs some more polishing.
Btw i really wont greeble it, but I might split plates, making them look like more "nature like"