that 5 incher fan that is on the light reflector.....that is a pc fan! it may suffice and it may not. only you can tell. although some thing tells me that pc fan will not be able to keep that light ALL THAT COOL, maybe a little, but not a lot!
if you are worried about odor, dont! the charcoal carbon filter/scrubber will make that smell almost non existent. If that doesnt work, add some ionizers or ozone generators. That will most definitely tame that smell! If you are worried about ozone poisoning you should just buy one or built one of those ozone generators that you put in the duct work. put it in the exhaust ducting and route OUT the house.
odor problem solved!
as far as the intake, im not sure as to what you are talking about because im not there for you to show me, but from what i can remember in the picture it sounds like it could work.
As long as the basic principles are met, you are straight!
I mean basic principles such as pulling in fresh air from the outside. More preferrably closer to the ground as that is where colder air resides. Remember to put a filter on the intake as well!