nothing special just a grid showing level_ent size - of course, its size is auto updated on entity placement outside actual boundaries.
a bit ugly on far distances but good enough for us
that green church is just a preview following mouse position, thus you can see exactly where it will be after a click.
I'm happy with everything, but too lazy to make the ground and water terrain placement menus... currently the only option is that ugly startup wizard, so it should be made anyway...