Does anyone know or have a link they could share about Cuboid rooms and if there is a way to link them to the main habitat hub that your home base starts at ?

I can see how to add doors to Cuboid rooms but getting a Cuboid room to connect to one of the corridors that is off my main habitat hub seems impossible, if anyone can confirm that this is indeed a impossible thing that would be great and I can give up.

Thank you again for creative mode and the savings it has spared me in resources in my normal play through !

The only way I've found is to do it the other way around.
Build your cuboid rooms from your base and it's hallways, not to it.
Unless you're some kind of wizard I think it's very hard to place a cuboid base in such a way that it'll actually line up.

I was just able to do it a few minutes ago after watching a video of someone doing it, like you said it is not super easy to be sure. You need to attach a cuboid room to a corridor piece that does not have a door attached, seems the door was causing the trouble but it still take a little work getting it to align.