I feel your pain on not wanting to wait months for your next harvest. That's why its good to have a friend. My growing partner and I have come up with this schedule so we can harvest every month:
Grow Room 1, Month 1, Day 1 - Start Clones
Grow Room 2, Month 1, Day 1 - Start flowering of previously vegged clones
Grow Room 3, Month 1, Day 1 - Halfway through flowering
It takes about 3 months to get up to speed but from then on we should be good for a monthly harvest.
Our Grow Rooms are just tents and he has two and I have one. His smaller one is for moms and clones and we plan on vegging the clones in there for about a month with CFLs. His bigger one and my tent are just going to be for flowering.
You really need 3 grow areas (or 1 small grow area and 1 really big grow area) to get a perpetual harvest.
As for light leaks during veg, I don't think its all that great but I don't think it will cause any damage either, but I could be wrong. I have just never heard of any issues with light leak during veg, it's always during flower.