There is no reason for the sides to be equal. I just did some where the
front was 3/4 and the rest 1/2.
With a crappy router you will either have to make several passes, or go real
slowly, which will burn. Take your pick.
Tear out can be a problem; I climb cut the ends first, which helps, but I
wouldn't want to do that without a sled. Fortunately one side be on the
bottom and not seen, so you might be able to bury the problem.
The first time I used them, I made the back piece two small, and when I
assembled them, the drawer locks broke. Poor craftsmanship, no excuse.