I got the first roll back, and so far, so good. My spacing between frames (using the "wind and pray" technique) was very erratic. I think I gave the scanner a serious headache. I have now added a working frame - clicker counter to the design to address this issue. You can also see a pink haze in some images on the right - my finger on the shutter. I have now fitted a cable release to the shutter, which should solve that glitch too. The only other issue was scratches on the emulsion, likely from rough edges on the film guide. I have now covered the guide with silky tape to prevent this, although the scratches are kind of interesting in their own right. It's not a Leica, after all. The pinhole (280 microns, or 0.28 mm) performed very well. The focal length turned out to be closer to 30mm.
A blowup of the above picture to show the pinhole performance. 280 microns is a bit large for 30mm, but it is working well. I make my own pinholes - for details you can check out my current ebay auctions here.
An intentional multiple exposure of the gazebo above. I decided to underexpose each time to have the intersections of the bars stand out more emphatically. The ghostly image on the right is an unintentional self-portrait - I underestimated the angle of view while taking the second exposure.
Your suggestions, comments and critiques are welcome!