Adding in more organic, rounded, or bestial options for customization would be really cool to me. I’ve always been a fan of mecha that turned out to be monsters (like Getters or Evas), and mecha with various animal motifs draped around them (like Braves or Zords), and having more options to customize in these ways would be cool to me. Maybe access to such parts or frames could be unlocked after a story event in which Quark biology is reverse-engineered to improve MASS frames for science reasons?
Below are examples I feel of mecha with Bestial parts/aesthetics and mecha with Organic parts/aesthetics respectively.
you mean zoids
No, I mean zords (as pictured below), but sure, zoids also are bestial mecha and would make for a good example of beast-like parts for armor or frames. This requests pretty much covers the net of beast-like or organic armor/frame requests. For more specific requests check out https://massbuilder.nolt.io/274 for animal-like frames specifically, or https://massbuilder.nolt.io/189 for alien-like armors specifically