[Ayukura]

This is an excellent strategy; Our team had the same idea. However, I fear that there will be many teams with the same strategy, (great minds think alike!), so much that you'll see a few robots on the playing field just sitting on the tower for half the match. Think about it: The match is 2 minutes and 15 seconds long. You guaranteed your team 50 points, and if a robot on the opposing team can accurately score frisbees into the 3pt goal, they have to score 16 frisbees in the 3pt goal. You can hold up to 4 frisbees. So, they'd have to be able to score 1 frisbee in the 3pt goal per 8 seconds. A robot that can shoot at an accurate and massive speed can outclass a climbing robot, and if it has a climbing mechanism in it as well...
I would suggest at least having it play able to play defense against really offensive robots before going up the pyramid. (Although sitting back and drinking ice tea while looking at your beautiful robot is also enjoyable) It's definitely really impressive, and, as Marc says, you're guaranteed to do well.
A robot in 3 days... I can't imagine it.