You should do it, it's a pain in the neck making the door, but it saves soooo much time cleaning them. They only pee and poo in the hay boxes at all really so you only need to change the hay box every day and give the bits that have fallen out the door a sweep up. You use up a big bag of hay a week, but it's so worth it so you don't have to change the fleece and hoover up poop & hay constantly lol
Just daeee itttt. I do it all the time when I can't be bothered chasing them about to get them out to play.....i think they prefer it because they know i'll go away eventually , haha.