Nice. Congrats. I have been drooling over the Regulars and F-Series recently. I found a project 1929 Regular on CL for $550, but with the width at the rear of 99 inches, I don't have a big enough trailer to go get it, even if I get the CFO's (the wife) approval.
I believe you have to join, but I added some files there though not too many on the Regular, mostly on the F series. Also, I added some files here on the pdf manual section that might help a bit.
I have been trying to find more "stuff" on the Regular, i.e., brochures, parts catalog, manuals, etc., but I haven't found any yet online that I can download. I did find a IH catalog from 1927, that I uploaded to that facebook group page above.