The sizes you have concluded to use seem perfect. The clone tent should hold roughly 10 plants (2 mothers and 8 cuttings at any time), then the vegg tent should have 4 going for 4-5 weeks at a time which can then be moved to the flowering tent.
It's easier rotating the plants than setting up 3 tent staggered by 5 weeks, the timing schedules you would have to track in your head would become too confusing - keep it simple, cloning tent, vegg tent, flowering tent. And possibly a drying tent... Keeping humidity is not important, I mean yes it is but you can grow from 30%-70% no problems, some will argue you can get a better yield if kept perfect but all you need to worry about is the right humidity while drying, a tent is invaluable for this as you need to keep humidity between 50-60% while drying. Humidifier certainly not needed, all you to is extract the stale air to lower humidity in the drying tent as the bud dries.
cfl are alright, I've recently started using secret jardin vegg led's. They look very much like a mini quantum board in a tube and so far I am very happy with them
http://www.secretjardin.com/catalogue/lightings/tled/tled-26w-growing/bl,product,193,0
They will grow up to 8 seedlings up to about 3 weeks using ony 20 watts of electricity
I prefer them to cfl.
flowering tent will need strong extraction, something like 600-800cubic meters per hour + carbon filter to match that, vegg tent will only need a little extraction and cloning tent won't need any ventilation.
