For this attempt, I changed up the rigid duct runs a little. Max flex duct length is 8'-8" sketch circles for accent lights are 2'-4"
Can you run a flex duct over a light fixture?
Should you run the rigid duct to the center of the supply/return risers as shown?
Can the accent lights be located that close to the fluorescent fixtures, grid, & rigid duct?
Can return grills be located <1' from walls?
Thanks for everyone's feedback! It really helps so much!