Thank you, I've done this, and now it works!
One more question, is there any updated Tutorial?
I'm struggling placing the parts, is there any trick to connect the parts nicely with the others?
I've built a little vessel, just to to become familiar with it, but it doesn't work.....
https://drive.google.com/file/d/1LzfaWn6iRF0TOkpnyGtfTEDPyRLguVGW/view?usp=sharing
Here is a picture, I tried to connect the tunnel piece with the rest somehow, but it didn't work...