you got alot of ducting, i would just get a inline fan not a inline booster fan. i tried them and they never worked for me. the other light you could, i would get a cooltube and vent both lights together with a 6 inch inline fan. other then that it looks good.
also, looks like your using windshield heat things as reflectors for your wall? i use flat white paint for my walls, and hang white poly over my door way. you can do that too if you want or even hang white poly on the walls. its nice and shiny white.