This have been under resturation for 28 years, and we stil havn`t solved it`s trough identity. It seems there have been camera equpiment installed in the tail once in the airframe. It is rebuilt at least 2 times from new.
Hope we can solve som of the equipment at this forum. problem is few picture taken iside the tail erea.
First up is the square replacment doubler at the kompas room as seen on the G8 tail picture.
You can also follow it at my flickr acount Me109 + alot of other interesting stuf
https://www.flickr.com/photos/108070235@N05/sets