Re: Installing drawer stops
John in NM
Adjustable is sometimes preferable, but I've found that it is often best to get things in the right place and allow no freedom of movement. I guess it comes down to the question of whether there is a way to organize assembly such that you have access to the back of the casework to fix the drawer stops where they go.
I came to this way of thinking at the day job, where degrees of freedom are the bane of my working day - it seemed like half of the first two years at this job I spent fixing un-necessary adjustments that had slipped and caused a problem (usually a safety interlock that then prevented normal operation of the telescope). So I now see the value in minimizing adjustments if you can possibly just put things in the correct place the first time. That is a rather long way of saying that I have really learned to appreciate it when things will not require tweaking in a few years - or beyond a couple hundred thanks to some brads! 
However, I do appreciate seeing your solution, even if I would not choose it myself. There are probably only a handful of posters here (and I'm not one of them!) who produce the quality and quantity of work that you and Bill regularly put up for discussion, so hat's off to you both 