I would think it depends on the strengths of the individuals you have to work with. I would consider 1 bass, 2 snare, 1 tenors personally. If the skills development don't support in, you might be better off with two different sized basses, 1 snare, 1 tenor, for instance.
The idea of the aux toms mounted on the snares would be useful. Maybe the 6" and 8" or cutaways for weight management. If I were playing them, I'd want them mounted forward of the centerline of the snare instead of directly on the right and left side.