This is an idea I had floating around. The basic idea is something like this. An ancient ship crashed on this planet long ago, before the mechanoids ever started murdering people. It would be an extremely rare spawn, and even then, it comes in several varients, ranging from mostly destroyed, heavily damaged, and completely untouched. It would also be unavailable on small maps.
The ship would be well, ship-like. 2 tile wide hallways, cramped quarters, cargo bay and engines in the back, some would have an armory. Various techs that you can reverse engineer, or just use, that is much better than anything you can build. i.e, a reactor that can power a ship.
Now here's the fun part. The ships doors would be locked. It requires a colonist to spend time opening them. If the colonist unlocks the ship, there would be a small chance (around 20%) to partially trigger the ships defense systems, releasing mechanoids that will defend it. If you break into it by deconstructing, you have a 50/50 chance of either fully activating the ships defenses, or partially activating them. If you do manage to unlock the doors without making the mechanoids hate you, however, you can potentially use them as your own. Assuming the door isn't broken.
I think it would be a fun addition, it adds something new to the game, which might reveal some story stuff, i.e going through the logs on the ship. It also has some neat incentives to get into it, while being pretty risky if you're not decked out. Even if you're decked out, it's risky.
+1