Problem with forums is that is not a easy thing to do. Especially if there has been a major change in the database behind the forum. As not all the functionality is available between different databases.Pity you didn't retain the ability to switch to a "Classic" view like some websites do (e.g. Ebay) for those who preferred the old format.
Yes you often can change the skin (colours and limited design) but if that still does not fit the old design, then it is a waste of resource.
Just a heads up to users. as mods we got to see this at the same time as you. Had no input at all on the changes.
As I said other car forums have had the updates before us. As other users have posted.