Nice video. I know I'm reviving an old thread but if you see this, have you considered making an adjustable height rack? I'm going to use your basic idea but want to be able to raise it up or lower it depending on the frags that I'm growing. It's going in my display so I have less control over the distance of the light and making it adjustable should be cool.
I was able to use the same eggcrate but what I did different was attach the glass cleaning mag. Now it can be attached to the glass and adjusted to any height. The mags in them is pretty strong and can hold up a ton of weight.