Nice, but I have some doubts. Airships are very sensitive to wind, so, unless they are in a closed hangar, they should always face the wind, held by the nose. The nose crane should be on rails, to move around to keep the ship facing the wind, and the land structures should be drawn so as not to interfere with the movement ...

Don't know how long it took, but probably less than you'd think, maybe twelve hours, in bits and pieces. It's very modular, one slice of 45 degrees, mirror once, rotate and copy three times. In the images I only show half, but obviously I can mirror the whole thing and get the complete interior.
I think this will be it for the time being, maybe I'll try to export it to Blender or Daz Studio and make a video ...

some more ...

I'll try to place the dome on a building loosely inspired on Michelangelo's scheme for St. Peter

I usually hop from sketchup (make) to Blender, and it is rather painless, apart some quirks. Blender accepts .dae rather well. Instead I've had problems with exports from Sketchup to DAZ Studio, which is strange, since both programs use .dae as the default format. Any idea?

I did it hurriedly, so the circular angle is a bit off measure, but you gtet the idea ...

Playing with FredoScale Taper. I think the reult is pretty neat

on with it ...

I've been recently to Cordoba, and the Mosque is fascinating. I am trying my hand at it ...
I tried to upload the .dae file, but it is not allowed. Why is that?

Thank you Chris. I was drawing the half dome of Maxentius basilica, and needed just that.