Actually I just tested the Skyui 5 and it sorta works. The biggest issue is the inventory load time, and the CTD if you go to the system menu (which sucks because SSE defaults to the quest menu when you hit escape...-.-)
Otherwise even the favorites bar works @_@
I've personally converted SG hair, racecompatibility, ECE, and Ygnord. Again to make anything that either is an esm to work, or a file that's dependent on an esm (non vanilla files) you have to change the masterlist.
So all you have to do to convert an esm to esp is run xedit. Load the esm you are converting. Go to the file header section. Go to the right box and under Record Header look for Record Flag. Over to the right of it you'll see ESM. Right click, and choose edit. Untick esm, and hit the OK button. Exit xedit. Rename the esm to an esp.
In order to change a masterlist to follow the new esp its always good to have a backup of the esm so you can load up the esp in xedit. Then just go to the same area you did for the esm. This time go near the bottom in the box. Look for the Master Files. Under Master Files you'll probably see something like this:
Mast - Filename test.esm
DATA - Unknown 00 00 00 00 00 00 00 00
All you have to do is right click on test.esm and click edit. Then rename it to test.esp. That's it.
I don't suggest using this process for releasing mods, only if your eager to test or play with the SSE. According to Arthmoor any esp or esm should be run through the SSE CK, which we don't have yet
This was how we did mods back at the release of Skyrim...except we didn't have some nice tool like xedit >.<