Method Question

I understand that it's intended that we use vision-based navigation to control the drone.

However, I was wondering if it's plausible that we try using a pre-constructed map of important target points within range of possible flight paths. I propose this because I thought color recognition (as presented by the team from last year) might be too little information or too easily mistaken for surrounding objects of the same color.

I was thinking that each point would be assigned a 3D location in relation to an origin (the origin could be the center of the music room), and that the drone could use its internal accelerometer, sonar distance sensor, and altimeter to keep track of its own location.

A flight path could be created by sending a list of target points in order of occurrence along the path, which the drone could then follow.

Do you think this could be done, or are there too many possibilities for error in the drone's capability to keep track of its own location?