@Ailantd Those look great. You said "online drawing session". Is there a URL we can look at next time? I want to know how to make my pencil do all those things.
I think option 1 hits the right balance between, 'similar to farming equipment' and 'big as a cargo ship'. I'd add more 'control room' or 'command bridge' windows at the top.
@Ailantd For me, the middle one (with the worm). The form factor is both unexpected and at the same time logical, with what looks like silo bins making up the body.