Now I read that as you can edit the ad boards and the stand tier fronts etc..
As they show in the image I know it does say create your home ground but I think that means through customising of those items!...
I may have missed something but an editor tool is not creator tool...
I don't want to come across as negative but I also don't want to be disappointed, it will be a nice touch even if we can only a edit those bits...
Well, it says "that allows users to create their own home ground for use in the game". For me it seems that we can create everything, not only edit the boards.