The thing is, if you want to make “music to rap over” it can be almost anything. Hell, some of the best “rap” I have ever heard was nothing more than a poet improvising over a jazz drummer and upright bassist.
Are you looking to gain knowledge from others who have similar musical interests, or are you just wondering who else uses Cubase in the same fashion as you do?
It’s a pretty wide ranging subject. One that could have many different answers/opinions depending on what exactly is being produced. Electronic only, acoustic/direct/live instruments and actual singing included? There are so many variables possible it makes it hard to say “I’m a hip hop producer”.
I don’t really know where I’m going with this other than … use the tools that work best for you to accomplish the goals you are out to achieve. Some folks even use more than one DAW software 
.
Don’t limit your creativity by comparing yourself to others or even caring about what they use to do their thing.
Even if you knew “Joe Blow” used Cubase (not to be confused with Kurtis Blow 
) I’m not sure what the benefit of that knowledge would be.
I’m probably not making you any more of a friend of mine judging by the way you responded to my initial post, but I just thought I’d throw a few more ideas out there for people to chew on.
A true ol’ skool rap lover,
Scott 