I can do it without user registration. It actually works quite nicely. The whole educational part runs on a WP plugin designed for the purpose. The WP business directory plugin with anonymous reviews runs fine. Each plugin has a dedicated subdomain. So far I have 5 WP subdomains in the works. The thing is, that with WP I can easily import the spreadsheets I get from people. With UNA it is a more lengthy and delicate process. In the future I would like to have a person hired to add data sheets. But I dont want the person to fiddle with the SQLdb. Thats another reason to use WP. UNA is not geared for multiple people adding data easily and there are currently no modules available for that kind of mid-level work.
The only issue I have(apart from the SSL issue, which should not be my issue as a user), is the online medical consultation. It has two parts. One is for pure medical consultation. The other is an online therapy system(like for people with UNA syndrome). Long time ago I did it with PhPbb. However for security and privacy, the users are required to create a secondary profile. Different username and password than UNA. This is kind of data is sensitive stuff and I dont want leaks of any kind. The data will be part of a national medical db(which I also have to build), which doctors can access to get medical history of people. I hope I will be able to use UNA for this as well... Or maybe I should leave it to be an independent system in a subdomain. I have to test different options.