some posts from a guy who has the full game
Regarding stadium editing:
6 different types of stand. It doesn't look like you can create a complete stadium ... element? Can't think of a way to describe it but no Allianz or Emirates here really. It KINDA joins up together but not in the style of those stadiums.
You can import images to have on the edges of the stands. Where advertisements would go, you can put an image of the adverts and it should look pretty damn good. Maximum file size if 5MB, resolution is 256x128.
You can change the ceiling of the stand as well, 6 different patterns. Importing image is 5MB, 256x512.
6 different fences to have, import is 5MB, 512x256.
6 different types of railing to have on the top of the stand, along the edge. Import is 512x256.
6 different pitch types, 8 different pitch surroundings where you can say how much grass there is beyond the touchlines. There's also 8 different style of track, concrete and running tracks for example.
Loads of different colours for the seats.
4 different dugout types.
4 different backgrounds for the outside of the stadium (mountains, village, city etc. Import is 5MB, 1024x256.
Four different shades of floodlights (white, orange, blue, green).
Import and export options.
just checking stadia limit ...
20 stadiums created, option to create is now greyed out
Hmm, looks like you can't use custom stadiums for teams already in the game. Surely that's not right?
In fact, you can't change the stadium for any team regardless. Tried to change Arsenal and Villa's stadium and you don't get an option to actually select the stadium when browsing, just options to reset to default and the back button.
Unless you create new teams, then it'll be useful but it looks like you can't even change which grounds the teams use so that's rubbish really.
One more thing actually. Is Ligue 1 licenced? Can't change their kits, badge or team name.
Edit: Can't change those details in the French, Italian, Dutch, Spanish, Other European, Other Latin American, Copa Libertadores or international teams. The only ones you can change are the EPL and fake teams. Does that make option files a lot less useful now then? If kits are wrong for those leagues, we can't change them in the game.
And the rest. Other than England and fake teams, you can't edit the kits, badges or team names of any other team.