C4c:
I am posting this info on this thread since we discussed the subject here, hopefully you will see it.
I am not sure if you decided to try making a litter box out of a tote, but I just made another one and found an easier way (at least for me) to cut an entrance into the tote. On catinfo she writes that she used a box cutter to make an entrance. I found it a little more difficult to do this than what she stated. I ended up using a soldering iron to create an entrance this time. I used a pencil to make an outline of the entrance and then used the soldering iron to melt away an opening. I found it much easier than using a box cutter or even sharp scissors. My hand was a little sore after I made the first litter box. lol
