I must be missing something here, cause I don't quite understand how would + shaped walls be more "aesthetically pleasing" than a simple square?

As for passing diagonal gaps, you're supposed to fill those

Octagons would help noticing the gaps indeed, but it would be confusing regarding LOS, since that's tile based.

edit: ah i think i got it how you mean the + shape, like a fat +. There would be still the LOS issue though. And the time to remodel every phase and destruction animation...

I think I'd like octagons as well. And perhaps Octagon walls could seal those corner gaps that are currently passable.

I am torn, though on whether I like the passable corner gaps in walls. Some one with a good imagination could create their own little maze of passable and impassable corners. So that what seems impassable to one is in fact passable to another.

Nah, just close those gaps ...with octagons. They cause too may problems esthetically and it really is kinda silly to pass through Them.

The growth phases have unique tops on them, that would need to be remodeld into octs.

You can? Hm, weird.

Tamas, maybe I didn't make it clear in my original post but this would be a cosmetic change only.  You wouldn't be able to stand inside a wall tile any more than you can now.

Also octagons would look nicer.  + is just an easier concept to grasp imo.