Hi Alex,
I asked the same question (for the same reason) on the Luftwaffe Experten Message Boards (LEMB) in December, as I also purchased a kit of this plane (1/48th Resin). I see you are asking this question on that message board also.
If you search lower down the Projects and Prototypes section of LEMB, you will find my question (I’m firelily on LEMB). I got some interesting replies, but no drawings or photo’s of the interior yet.
The best reference by far is “Kurt Tank’s Photo Album 1940-1943” compiled by Roy Powell & Barry Ketley, Flight Recorder Publications Ltd., England, 2004, ISBN 0-954605-3-1.
I have this book, and it has some lovely close-ups, but only limited views inside through the front canopy.
Good luck with the model, and let me know how you get on with it.
Steve