Doug,
Just got home and looked at BeerSmith. My memory was close, but not perfect.
Mash thickness: 1.45qt/lb
Mash Tun Addition: 0.71gal (RIMs, hoses, etc that get drained into the kettle)
Deadspace: 0.3 gal
Pre-boil calculated gravity: 1.055 (@ 75% brewhouse efficiency, 83.5% mash efficiency)...