Oh, yeah. I remember those blocks. When I just bought Space Engineers, those blocks was in game.
Maybe someone will make a mod for it? Maybe I will, but it will not be soon, 'cuz I'm bad at coding.

There were actually 2 sets of blocks that are gone now - 1. Sloped "Half of an armor block, these blocks can double as steep, 45º angle ramps on stations or large ships. The blocks will match up (as in, without seams) to corner blocks and inverted corner blocks on its sides and match up to the default armor blocks its two square faces. This block can be welded to other blocks on four of its five sides." http://www.spaceengineerswiki.com/Light_Angled_Armor_Slope
and 2. Smooth / "Smooth Blocks "These blocks will "pull" their surrounding blocks towards themselves when created. It's possible to create different angles and slopes by using a combination of smooth blocks."

What are those blocks?

@Marks2103 - thank you for reporting it. It seems the blueprints with discontinued blocks don't spawn properly anymore. I have placed a note for everyone in the description.

Those blueprints are not working :(

Aint I seen you in the Stellaris workshop?

also what is the program you use to edit pics and how do i get this background as on the pics

please could you do a factory new version of the ship without broken blocks :)

ITS CONTROLLING ITSELF AUUUGH ALIENS

please make more xenos plz :)

i jot kidnapt by this ship it took me to its lair

@FoxLocks / Sorry man. It's just a joke. But smooth armor blocks which I used are known to break the game when you try to alter them - so there is even some truth in it. Thank you for discovering a real alien on the ship :D

Oh... ok

@FoxLocks / It's the Alien ship preventing you. You should have listened to Space Engineer Wade Carson who tried to change the Cuttlefish: "The worst thing is that I depend on the life support systems of the ship so I cannot salvage it or abandon it. I tried.. and I swear that the ship rotated on its own, barely missing my helmet."

I keep having this problem, I dont know if its just the game or the ship, but whenever I start trying to destroy or build block onto the ship my game crashes.

The XENOs fleet now has the Seed and Worm XenoBots available in the collection. Check it out and start assimilating the puny humans.

Please continue this XENO fleet, cant wait to see whats next.

Cool,will try it for sure.