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Fun fact about Orks: Everything they build are defying the laws of physics. Their guns, vehicule, bombs and other devices are made without any real working structure, and operate only because the orks believe in them to work. Basically, Orks in Warhammer 30-40k have a collective psychic field that make their stuff work. When other species are trying to operate ork weapons or device, it just don't work. Funny enough, if you check inside ork guns, there is no firing mechanism - sometimes just random objects like a teddy bear, branches and bits among other stupid and senseless crap.
And when they assemble into a Waaaagh, there are more of them collectively believing into their crap working, so they can make derelics ships, hunk of scraps and space hulks into space vehicle that can function in the void/warp, therefore, enabling them to go on a big scale conquest. They can also make gigantic Morg or Gork effigies of their gods (Mork and Gork) that operate like gigantic robot, about the size of an Imperial dreadnought.