That's a cool kit! I hear ya. I added time for stuffing boxes but did not add time for creating masters. In this case, the master pattern cost was repaid in the first run. This is the second run but the master was modified, which was listed. I'll be adding master pattern cost in the next two project posts. Included would be research, correspondence with vendors, etc. One was 3D printed and the other modified from a kit. I'd really like to get more of your input (and other casters here) because my costs (and ways of adding them up ?)will be different from yours.