And I believe that it was good that the boys are never described much (contrary to Weingarten's disappointment at the discovery of that). It's not a bug but a feature -- it allows the readers to identify with the boys more not less!

I've read a bunch of Perry Mason books as I was very young and I remember that none of the main characters was described much. I believed even then that it's good so. I was able to imagine them as I'd like them to look like.