Stair Illumination: Location of light
The only thing that worries me is odd placements of the lights and switches requires more wires than a typical /3 cable includes, and that invites bad wiring, e.g. using two 12/2 cables where you need a 12/4 cable.  

Also, in this day and age, remember the light switches need real neutral at the switch.  2-wire switch loops (3-wire if 3-way) are outlawed in 2011 NEC.