I'm looking for input on the safety and code compliance of the wiring plan i've detailed, shown in the photos below.
Description of the broader project
My jurisdiction is subject to the 2014 NEC. I'm planning to install downlights throughout my house, on one circuit, power at light, with groups of lights on separate switches (led fixture housings rated for max 25 watt bulbs, and airtight-ic Halo Model #H750ICAT). There will be nearly 50 of these fixtures on this one circuit (intending to install with 20 amp dual CAFCI+GFCI breaker (Square D Model #QO120DFC, using 12ga nm-b cable).
Description of this portion of the project detailed in the photos below
This particular portion of the project is for a bathroom; one of the light housings will be installed above the shower (thus the AFCI+GFCI protected circuit for interior lighting, to provide both AFCI and GFCI protection).
Photos of Electrical Diagrams
The first pic shows the switches in the room I'm focusing on with this first stage. Please ignore the fan/heater/light/night-light unit; I'm specifically looking to get input on the safety and code compliance of the downlight wiring.
The second pic shows the general principle I think will allow me to carry power across the light fixtures, while switching groups separately.
The third pic details the principle in the second pic in greater detail