Some good links for basic information

I found a few good links at the NASA and arssdc wesbsites you guys should have a look at.
These links will give you background information you need to design your own space colony

Needs of the the people in space settlements.
http://settlement.arc.nasa.gov/designer/needs.html

Formulas, facts
http://settlement.arc.nasa.gov/designer/tables.html

For Mathematical Calculations.

Computer assisted design (CAD)
http://settlement.arc.nasa.gov/designer/sphere.html

Life Support Systems. (CELSS)
http://www.nas.nasa.gov/Services/Education/SpaceSettlement/designer/regen.html

Some good pictures at
http://members.nova.org/~sol/station/settle-p.htm
 
Some of these links may not be of immediate use, but will definitely help out later.
Kush Agrawal