If you go to the valhalla portal in tnt go though the em portal in that hub you end up in my workshop and there is a color storage portal to the right as you exit that portal. (right as in around the corner to the right).
I copied fante (Color storage ideas) except i squeezed the height down to 6 blocks instead of 9 so that i could make my color storage 2 plots high instead of 4(its 1658 plots total)
Here is the spreadsheet i used to help me break up the colors into two floors:
that first tab is also a template to help make a color storage map like you see int he first picture.
I had help from Izzabell, and by help i mean she built most of it while i tried to keep up
here is a video on how to get to there