yes, rendering can use a lot of memory.
However, I would suggest sticking with quality rendering.
Render fully only those objects which the camera can see, as it were.
Switch on/off layers/xrefs as required.
Items/objects/models in the background/further away can be replaced with images.
Kai uses this trick to create a forest of trees.
You can cut your ship into sections either way.
Have a think about it.
You can design without engineering, but you cannot engineer without design.
Using Win 10 with Designer 2016/2017 and TurboCAD Pro. Plat. 2018/2019 + Lightworks (64-bit versions) + AnimationLab 5.2.
Windows 10 Pro (1909) 64-bit