Don't know, maybe people already seen this site. There's a lot of pics of the schnellboots including the helm and torpedo aiming gear.
https://www.histarmar.com.ar/InfGral/Schnellboote-Ppal.htm
It's a Spanish site but good ref pics.
https://www.histarmar.com.ar/InfGral/Schnellboote-Ppal.htm
It's a Spanish site but good ref pics.