I have posted here for a while but I wanted to share today's test exposure because I took it using a homemade integrating light meter that "counts" the light during the exposure and gives an estimate of how long is left for a good image. There's a display that shows time elapsed, time remaining and % complete, and you can select Harman Direct Positive, or RA4 reversal, in either 4x5 or 10x8.

If a cloud comes over during the exposure, the meter slows down accordingly so it's still properly exposed. I'm pretty pleased with the progress so far.