I just made the borders based on a culture map to be honest. Then again maybe I should double check my sources.Ok, again me
I really don´t like OTL border between Hungary and Romania, I think that with pre-1914/18 PoD are highly unlikely (something akin infamous Kazakh borders)
What about Bukovina going to Dacia (it was originally Moldavian territory I think?), as well as Transylvania, while Crisana, Maramures and Banat (other regions lost by Hungary to Romania) staying in Austria? Or you can of course play with it a bit and split these territories acording non-otl borders or something...
On the other hand, your main focus is on something else
This map is already a hypothetical so it's not like it carries much weight or is very important. Though since you are interested in Austrian partitions I'll tell you now (so I can take your suggestions into account before I make the map) it's going to happen. The Hungarian Revolution is going to succeed in 1848, ripping all of dejure Hungary out of the Empire. My plans are to have the Duchy of Warsaw "quell" (I.E march in to be welcomed by the Polish Rioters) Galicia, and have Russia occupy Loderma so it doesn't fall to poles. Austria will be left a rump state likely forced to join the COTR.
That's the plan atm. Input welcome.