ehm.. spokes? If you mean the grey struct of the solar panels no, it isn't extruded.
I think that in the (far) future I'll remodel those ships cause I'm not 100% satisfied.
Those are my very first 3d model, I made em when I didn't even know exactly what an uvmap is, I'm just optimizing those models for HTL, adding some elements and removing some visual weirdness.
For the future I'd like to rebuild those ships using better strategies, I'd like for example a more rounded cockpit with a spherical uvmap instead of 2 planar uvmaps (which cause some distorsions), and more detailed solar panels, but for the moment they'll stay as they are