I've done a bit of pinhole, and 35mm just seems an exercise in frustration.
It can be done, but *much* better results await with larger formats, even with paper negatives.
Build your own, my 5x7 is literally a shoebox.
Also, check out f295.org, a superb pinhole site, the best, in my opinion
some overlap, but these are all 4x5 and 5x7: