My Pictorico viewfinder did work so after a trip to the hardware store I made one out of brass with about $8-$10 worth of "parts". It is detachable and works for either horizontal or vertical. I have only made 16 exposures so far and have not enlarged any but have made a few pt/pd prints that I am very pleased with. Scans with no enlargement have also looked very good.
My feeling is that pinhole photography is a technique to its own and doesn't need to be compared to capture through a lens. A very large enlargement or perspective adjustment from a LF view camera shouldn't be compared to 35mm. Doing your best within the limitations of a format should be the goal IMO.