How do I connect to a dishwasher bushing?
"Do I just go to town on the end of that with a hacksaw and clamp on the drain hose?"

Yes.  The end is capped so that it can be installed without being connected to anything.  Leaving it uncapped would leave it open for leaks if you were to fill the drainpipe.  

Just cut off the end as near to the cap as you can reasonable fit a saw, and slip the hose over it.  For added security, use a hose clamp to secure it.