Hey I hope everything is going well for you, I assume you've made the move and don't have access to internet frequently-if at all. Just thought i'd let you know you got my support! I think what you're doing is great. I saw your old thread like a year ago, very inspiring and idea provoking.
I had some questions though(it will probably be weeks-maybe months-before you're checking this but someday ill read your reply). But anyway... I must be missing out on some pics, but how do you plan on keeping the room sealed when you push the sides together? Also, the light won't be able to hang dead center because the center will be where the sides seperate correct?
And for the idea you have given me, I wanted to do a 6x6x8 using 2 600s(better specrum so i'll probably never go thouy). But my concern is space. Socal gets fuckin HOT so i need to go 8" cooltube, and with 9" shelves that only leaves me 2ft of walking space in between the light. Im not fat but still, I've already realized anything over 16 plants in there and watering will be a sunburn nightmare. Im thinking you need 1000w's with vert for space unless you've got removable walls, which almost seems like too much complication. I'd love to hear more details though.
You asked earlier about veging vertical or horiz. Definitely do vertical, like it was mentioned before: you don't want your plants to waste growth growing toward an overhead light when they're going to have to go through a dramatic change when flowering(also wasted time during the 1st week having to move towards the light, and I'm sure "waste" is not something a person like you'd allow
)
Stay positive!