Thank you!

I love Spotmatics! Sadly, the ones I inherited have light leaks.

If you're not going to use the viewfinder, it'd probably be a lot easier to use something wider than 50mm. Besides the greater depth of field making zone-focusing a lot easier, there's literally "more room" for error in your (somewhat accidental) framing. Makes things easier. But I might be biased here, as 35mm is my favorite focal length on any camera!