While poking around in one of the interiors of my mod, and when trying to reload the objects in the cell, I got a message telling me the World/interior was too big, and that Havok would be disabled if it wasn't made smaller. Something along those lines.. I did not print screen the message

This sounds somewhat like the issue with normal exterior worldspaces getting too big (more than 64 cells from the center?)

So in case nobody knew this, interiors seem to have some sort of limit as well.

Havok has always had a limit in interiors. It's a rather huge radius however, I don't know how you managed to reach it

Ah, okay.

Is the center of the "havok radius" at 0,0,0 coordinates in the cell? Because all my objects are placed on the negative side of one axis (the closest to 0 being -250), and expanding further in that direction causes the error to appear. So does this mean that I can expand the cell an equally long distance in the opposite direction, without triggering the message again? (my errors start appearing somewhere beyond -15000, so placing things at 15.000, would that work?)

Dude, this is Grand Duke Adense, he is insane.

(It's not a bad thing, it's just true...)

Dulicate your cell, delete half from each, and connect using a load door.
15000 units is rather large and would kill less powerful computers.

Sounds like you ought to consider converting this giant cell into a worldspace instead.

Yeah, try to start things at 0,0 so you have the most available room. However I'd agree with the others, either split it into two cells, roombound it well (if it's within the havok bounds at 0,0) or convert it into a worldspace.

It's actually just a very long and narrow room, used for a special scene, so I can't separate it into two cells.
And as far as I know, it isn't very resource intensive. Many vanilla interiors cause more of a performance hit than this. I don't even notice anything in my cell!

Perhaps I can have someone with a weak computer test it sometime in the future, and see if anything explodes..

You could shift the whole thing over so that 0,0 is in the center of the hall instead of at one end. See if that helps any.