So here's some food for thought-
your box is on a 4x8 area, with 2 columns. 4x8x2 = 64, then you've got the additional 2 plates top and bottom, and then the print bricks on top (stopped watching the video, presumably 12 on top) putting your grand total at 78 bricks.
What if I told you that the inside of the box could be hollowed, and by using larger print bricks on the top, you could cut out 26 bricks still just using your defaults. That said, the print bricks are pretty wasteful considering on the sides of the box you can still see the brick cracks, so you may as well just use larger bricks on the sides and back.
Another fun fact, Ctrl + E lets you scroll backwards through the paintcan GUI. When you had to scroll through a good 4 times you really kinda killed my attention.
kinda cool I guess? Congrats on using a randomizer event