[Flat Six]

Good for you; your daughter's a lucky girl. Good advice above. I'd add:

1) Make the enlarger table as absolutely stable as possible; even slight vibrations will blur prints. Separate from developing tables if at all possible. Think 'wet' side and 'dry' side
2) +1 on the drain and vent
3) Some kind of hard floor that's easy to mop if necessary; no carpet (dust)
4) Keep the drying racks high (dust); I've had success making wood frames & stapling window screen to them (prints face up to dry, face down for matte look)
5) If basement is un- (or semi-) finished, insulation and drywall -- no open studs, underside of stairs, etc.

All I can think of at the moment; good luck and keep us posted.