I wrote a set of threads on my SSF experience:
https://discuss.pixls.us/t/the-quest-for-good-color-1-spectral-sensitivity-functions-ssfs-and-camera-profiles/18002/
https://discuss.pixls.us/t/the-quest-for-good-color-2-spectral-profiles-on-the-cheap/18286/
https://discuss.pixls.us/t/the-quest-for-good-color-3-how-close-can-it8-come-to-ssf/18689/
https://discuss.pixls.us/t/the-quest-for-good-color-4-the-diffraction-grating-shootout/19984/
Regarding the K-5 data, it’s just a half-assed supposition that the cameras in the Pentax K line would have similar Bayer mosaic dyes. Here’s the data; the JSON file is directly digestible by dcamprof.
https://github.com/butcherg/ssf-data/tree/master/Pentax/K-5/camspec