[tor-relays] exit node with private directory server

I have been reading the documentation and trying to get up to speed. Much of this is new to me.

My goal is to have a directory server that is only available on my local-area network and on the same machine run an exit node available to the "onion network". Is this sort of configuration possible?

I am installing a dedicated FreeBSD 9-beta computer at the moment and want to run run this configuration as my first tor installation.

Darrel