Our team did one the year before I was on (also during our rookie year). Those who were on the team didn't really like it, and said that to take full advantage your drivers need to practice. Take a look at our page on our Swerve:
http://www.teamneutrino.org/seasons/...swerve-module/
However, I recommend taking a look at a butterfly type drive (where you can have 2 different wheel types.
http://www.teamneutrino.org/seasons/...bot/butterfly/