Deine Mutter You are in luck. I've been playing with the source code and have been able to get the grid size up to 60x60x20 ( the 20 are the layers up & down )
Have to work out some bugs ( npc's stop from edge to early ) but seem to work otherwise

I have NOT done any test builds as of yet, so that might be another
problem to overcome ???
I do need some "input" from other members as to what a "good grid size" would be ? 60x60 grid appears big enough ( I mean it's BIG )
but others like you might want it larger ??? Also the "Layers" up & down. I'm trying to make this simple some levels don't
get TOO big. How about just for now 5 layers up & down ? 60x60x5 or 80x80x5 or even something unique like 60x40x2 ( anything/size is possible )
Now remember, I'm using V1.20 ( not Black Ice mod ) and with the new grid size any old maps are no good. This would need a new, fresh, clean install location,
all by itself for testing purposes if this would even work

For all I know the builds might become so large it's not worth it in the end

My games never have bugs. They just develop random features..
Lots and lots of random features...