You don't have to wait for PG Music to release the individual drum hits for you, there are tons of drum sample packs floating around the internet... I have about 20 gigs of individual drum hits in my sample library.

I lay out my beats with Reason, but to do this in RealBand, you'd probably just have to put together a kit in a drum machine plugin, like Battery, and write your patterns out with MIDI. Loads of fun.