Hello
attached is an interior view of Walter Radler's Appia 3rd series berlina which has been modified by Nardi in period for "racing".
Walter Radler was Austrian champion in the state touring/rallying championship with his Appia.
He had the car prepared by Nardi which included a different cylinder head, carburetor as well as the interior. Walter Radler recalled the price of the Nardi work as a "hair-cut".
I think the interior and the seats look quite suitable for the purpose!
If you want to find more on Walter Radler and his Appia please go to LANCIAnews.com and search for his name. You will be surprised!
Best
Josef