The Veg chamber will be 2x1x2 and flower 2x2x3
You are supposed to wait until after harvest to cook your mj, that light is going to be way too hot for that size chamber, a stand-alone 2 door wardrobe/closet is around the size you want for a 400w HID. I would be looking at using around 4 20w CF's in the veg and a 200w CF in the flower chamber myself, they aren't as good as HID's but you don't have a lot of options unless you go for a bigger set-up.

What ventilation are you planning to run? Good airflow is every bit as important as good light.