Don't worry.
I also resumed my work on my old Nightfire mesh.
I liked the amount of details I placed on that thing back in the day but thought the poly count was a killer.
And I wanted to use it for closeups ... which was good, but not terribly suitable if you remember the fact that my windows had sharp edges.
I have restarted my work on it and remodeled the saucer section along with the secondary hull.
I still have things to iron out before I move on to making the hull grids and windows (it will mostly resemble the old thing but with better optimization ... however the new nacelles I made upped the poly count significantly ... will have to cut it down
).
Then again, I couldn't care less about the poly count if the quality will be on the level of my NX-01 (if not higher).
In any case, I like the fact you added some details that resemble the mushroom base :-)
And for the interiors ...
I would recommend you don't model a large structure inside the smaller cones mid section as it would only take up unnecessary space (unless you place something along it's internal walls, like extension arms that serve like slots for ships which could be placed in a circular manner when inside).
For the internal part of the central station area, an internal structure would be good because it would remind us it has a very large power core and turbo/shafts.
It's immense either way so you should have more than enough room for it in that part of the station).