I would the Hanson or Grip-on trays, except my drawers are not tall enough for my deep sockets to stand up. Perhaps when I upgrade tool boxes, I will try to get a few more deeper drawers, but for everything else I have, having shallower drawers but more of them has worked out well for me. Just about every drawer is neatly organized and uses all of the drawer width, depth, and height.
The down side to the drawer inserts above is they are not portable. When I just take individual sockets with me to my tool cart and then whatever the project may be, I lose them. Even when I come back after the job and see I am missing it, it is no where to be found. And I am not a big fan of not being able to really adjust it to fit my tool configuration.
For quite some time, I had plans to make my own metal socket trays with bails to hold all of my sockets. My sets are complete with every available size, so I don't foresee a need to expand the individual trays. If anything, I would only be getting a new style of sockets and they would warrant their own tray to be made. But then I found a few old ones that I tried out for awhile. And I am not a big fan. The bail works great when in place, but often fall out of place and then I get sockets everywhere.
I actually found this site because I was looking for ideas to better organize my sockets. And this thread was the first I read. I really liked Elroy's design, as I was looking to do the same thing and trying to figure out the best way to do the bail. After seeing that he made the trays and then dropped the sockets on rails in the trays, I think this will be the route I choose. It appears that he plans to still add bails (and probably has by now) but I will forego that step.
I already have my sockets organized on the rails. 3/8" drive 6 point deep on one rail, 1/2" 12 pt shallow on another, etc. I will cut the rails down to the needed length and form a tray around them. The tray sides will prevent the sockets from moving side to side and should help stabilize them on the rails. It should make them easier to carry as well because the entire weight of the rail and other sockets won't be dependent on how well a few sockets are gripped by the rail.
I had concerns about how to keep the rails inside the trays. My first thought was to fasten them to the bottom of the tray. This would leave something sticking through the bottom, making it difficult for the tray to sit flat and asking for it to scratch something. I could counter sink it, but then the tray metal would have to be thicker than needed adding bulk, weight, and cost. I wanted the rails to be removable for the times that the rail clips needed to be adjusted to apply the right amount of grip on the socket. Over time and repeated use, they tend to loosen and the sockets come off to easily.
My current idea is to run a pin the length of the tray. It will go between the rail clips and the rail in the valley formed to strengthen the rail lengthwise. I will try to get around to fashion something up today to give a visual idea of what I mean. At this time, for my needs, I think this will be the most effective method. And I should be able to do it with the tools I have on hand.