We build two identical(except for paint) robots. Or as nearly identical as we can get with the exception of OI and some other minor things. We ship one and practice with one. We also have a full field(almost completely donated) to practice on. Some may say we are a have team, and I will openly agree to that statement, but we also try to open our facility up to as many people as want to come. We recognize that there are teams with little to no funding available for things that we take for granted some times, and therefore try to level the playing field a little. The only reason that we manage to get two complete robots in 6 weeks is a lot of hard work, a lot of donated machining, and asking for two of everything. Yea we have to buy a lot of stuff to do two(motors etc), but our twin usually ends up being scrapped after the first or second competition, mostly so that we have spare parts. With teams usually making a lot of spare parts they too could be able to do this. Also when we build our two, we build them at the same time. Usually we have a mentor showing students how to do stuff on one, and then the students doing it on the other. In that way we are also able to show the students how things are done, and then the engineers have a lot less to worry about come competition time because the students can fix a majority of the problems that may arise.
Picture here
http://www.chiefdelphi.com/forums/pi...&quiet=Verbose