Hey Stripes, you have to remember that you're not even at the 10% mark yet. If you start getting bored try changing the speed at which you do it. Do a page at double speed, only spending a couple minutes per box, then slow it down and spend twice as long on each.

The idea is not to draw perfect boxes it's to get better at understanding how a box sits in space.

I still made mistakes right up till the end, they were just getting less frequent.