Awesome screen man. You are like 2-3 weeks ahead of my first scrog grow (my first grow period). I am in the same question period as to harvesting at once vs. in parts.
Having never harvested anything before I'm not sure..... but, I think I'll be doing it in parts. At least 'layers'. I unlike you totally overgrew my screen. It's kinda cool because it looks like a jungle, but it was a lot of extra work, and I probably gave up some yield by shading more than I should have. Anyways, I have some stuff that gets more light than others, and from what I can tell on the trichs they are developing quite a bit faster than the more shaded stuff.
We both shall see just how possible it will be to do in parts. It might be too much hassle with the screen kinda connecting everything.
Either way, great first effort. The casters are a great idea, I wish it would work for me.
And to JSkywalker.... you can do it in that space man. Heat will be your biggest issue, but I have a tall rubbermaid dwc under mine and 650w of light and it is contained in the first 4' of my closet. (I use the top part for the ballasts, fans, and ducting, so good luck fitting everything). The screen should be about 10" off the soil, the plants should only get a few inches above the screen, then gap for light. BAM... a screen full of bud just like Thcofgreen
I bet Thcofgreen would agree though, a screen it quite a bit of hands on work.