I had Prominent with Nokon 50/1.5 in the past, used it both for film as well as adapted to Sony FE mirrorless mount. The lens is quite legendary for its out of focus rendering, and in general good character. It will definitely benefit from a lens hood, but finding the original metal one might be pricey. And the inside filter thread is of an odd size, 45mm if I remember correctly.
It was a while ago, but I remember adjusting the rangefinder on Prominent was not that hard. I was using a laser point through the rangefinder optics. Hope you can find some instructions online. The viewfinder is small, so I use a Voigtlander Kontur viewfinder for 50mm focal length.
At that time I purchased a Yeenon Prominent to Sony FE adapter off ebay, which has the focusing helicoid and is precision built. Nowadays there must be other brands and other mount support as well. It is well worth to use on full frame mirrorless, especially for its character,
Nowadays I own Prominent with Ultron 50/2 and Skoparon 35/3.5. The Ultron is not as sexy as Nokton, but has slightly more resolution and sharpness.
The first half of my Prominent folder on flickr were made by the Nokton. The second half by Ultron.
Voigtlander's interchangeable lens rangefinder system, boasting some of the best lenses of its time. The most famous was Nokton 50/1.5 for its unique bokeh. My all time favorite Ultron 50/2 for its well balanced sharpness, high resolution, medium contrast, and smooth bokeh.
Hope it helps.