[Aroki]

I would avoid floor pickup, (in my opinion at least) the advantage of being able to pick up from the floor is less than the difficulty of designing a mechanism that picks up and can also orient the frisbees, and the time spent doing that would be better spent making a good climber and/or a reliable shooter/loader robot. This also removes the need for a floor pickup to magazine mechanism

In regards to the magazine to shooter, I'd suggest:
1. Conveyor belt under the magazine made from surgical tubing or timing belts (with the teeth pointing outwards).
2. A motor with a bar that rotates around and each time pushes out the bottom frisbee into the shooter
3. A piston behind the magazine that pushes the frisbees out into the shooter