For any who are interested, Rutherford's infamous bomb shelter at "Beth-Shan" has been officially documented by The City of San Diego Historical Resource Board. They have photographs, plans, and an interview with the couple who built their home on the land (5330 Le Barron Rd). A PDF of the full report can be found here:
Mention of bomb shelter on page 7
Site plan on page 34
Bomb shelter photos on page 71
Site history on Page 73
Interview on page 80
Based on this information and historic images from JWStruggle's "Beth Sarim" video, I have been able to reconstruct plans and sections of the bomb shelter and "goat barn" as it was in the early 40s. My work is here (scroll down):
Also, I would like to appeal for any and all images you may have of the main house at Beth-Shan - especially interior shots or floor plans. It would be very interesting to know how the building was used in Rutherford's time.