We had a similar idea, we posted about it
here,, but under no circumstances do we believe this will be a 15 second climber. We have run into a number of issues with this design, especially when it is carrying the rest of the robot with it. We have ended up with a system that we hope will make it up the pole, but we are really in no rush to get up there. The current plan is to have the robot drive over, fill it up with 4 colored disks, drive it up to the top of the pyramid, and dump them in for up to 20 more points. We want to give ourselves as much time for climbing as we can. The dumper isn't in the drawings because we don't currently have a computer strong enough to model the whole thing.
Hope this helps, or that someone can use some our info.
Edoga