Where can i get special blocks and objects?

Like ship background blocks and doors?

Also - is there a way to get block and furniture for your race if there are no villages for it?
I'm playing as Hylotl.

 

You can get ship blocks and ship doors from your ship. You cannot get blocks and furniture from your race if there are no villages / dungeons for it.

 

Door i can scan and replicate, but i can't do the same for blocks. And there is a very finite number of ship blocks. That's my problem.

 

For "wall panels" you can craft them in your inventory after getting a portable 3d printer and using it.

(You can obtain a portable 3d printer using the research station, you can get access to the research station by upgrading your ship a couple of levels).

 

Also for the walls and support beams (I think that's what they're called) they're both found in the same dungeon, being the one with a low gravity field around it and the matter block dispenser, guys in purple armour, floating breakable blue crystals and glassed off lava inside.
That dungeon also contains pressurized steel and pressurised beams, both of which are shown (in the few available pics) to be used in the not-yet-existent Hylotl underwater cities.

For the Hylotl furniture and the pressurised girders, you'll need admin commands, or to wait until those are added into the game.