Do you intend to make any kind of scatter terrain- barrels, etc. not affixed to walls?
I did work on a container last year:

Looking back at it, I feel I can come up with something better. Also, I'd like to design some smaller crates and barrels.
If you want to follow an idea from Space Hulk, you could make air vents- exactly the same as corridors, only smaller and higher.
Might be an interesting idea, might play with that in a later version of the system.
Right now there are still two major things that need to be done, and I've been postponing both of them:
Hollowing out the wall componentsThe wall components are currently solid pieces. Whilst that in itself might not be that bad, it does increase the print costs greatly. Not only that, it also means more material is needed to cast the models. That isn't such a problem since the material doesn't cost too much, however...weight will pop up here. If we can decrease the weight of the models, shipping costs will greatly decrease!
But hollowing out the components is a very time consuming thing, and I've been postponing it for a long time now. Will have to look into that shortly though...
Doors/gatesI've been wanting to do them for a while now. I really love the idea of those very heavy hangar doors. I'm a big fan of what Forge World did with the
Zone Mortalis doors. However, I'd like to do something a bit more modular in nature, meaning you could easily conect multiple doors to one another to make it look as if you've got these super wide doors.
The 'minimum requirements' for a door system would be:
-new wall variant (one that can support the door)
-door component(s). Not sure if it will be a single piece or a two piece bit that allows for other doors to be placed in between if you'd want to make it wider
-new floor variant. I'd love the idea that the doors have "teeth" on the bottom and the floor has holes for those teeth to enter. Just looks a lot heavier and more intense. Will try to play with this asap.