I believe that your best bet would be to get in contact with Ivan Bajlo, he is an enthusiast like you and is running the website
www.vojska.net (vojska is croatian for military), and from my brief check on his site, he already has OOBs of Yugoslavia in different time periods (and of other Balkan countries, former and contemporary).
This is link to his site:
http://www.vojska.net/ and link to OOBs of former JNA
http://www.vojska.net/eng/armed-forces/yugoslavia/ . You should probably check with him (or check on the site), on if data shown there is free for use.
Ivan does check this forum as well, but I believe he does it less frequently, maybe on weekly basis so your best bet is to email him.