Just finished this little project, using repurposed 35mm viewfinder parts with framelines from a Canon Sure Shot Owl. The housing is 3D printed. Good match for the 23mm Fujinons. The Owl has perhaps the largest viewfinder in a P&S, with 0.68x magnification, and close up marks. These cameras can be acquired for a song on ebay. (I paid $7.33 for one, and $10 for a second, including shipping.) Total weight when assembled 14g, or 0.5oz. A great big view with zero weight!