1. Got these null tiles. Haven't noticed them since my Prison was on the bottom edge of the map. Fixing is easy
2. To see the new base in the Quick Battle, you need to delete your user/battle.cfg file (and if you have an old save with base defense, it won't be updated either, until the next base defence comes up)
3. You won't get new terrains without Piratez_planet.rul enabled. ALSO the old terrains are still present, I haven't removed them, why?
City terrains, with crashed UFOs, are purposefully included in some crash sites (mostly N Hemisphere, temperate zone), just the chance of stumbling upon them is low.
4. The corpse is pretty much identified, it's Curch Zealot's corpse... However I have no idea how it could have ended up at your base. Nothing was changed and I guess we've both killed those guys by a hundred without any glitches... curious.
5. Large Barracks - it's impossible for it to sometimes work, sometimes not. Either it does or it doesn't. Unless you're using some other mods that include this kind of building, that is. Remember that Piratez is incompatible with most mods out there, and ESPECIALLY with my other mods, like large living quarters mod or old Piratez versions.