gett'n rid of all this small 12V adapters... and a sneak preview of what is coming if you listen well.
Black Sharpie is the case-modder's friend; you can make that little Dremel hickey almost completely go away with just a dab.
I'm afraid you're going to find that 12.00V-ish at the terminals is going to be too low; voltage drop across the patch wires to your projects can cause a difference of 0.5V or more delivered to the DUT. To give you some idea; even the industrial-duty HP server power supplies (nominally 12.0V) come set to 12.40-12.50V to account for line loss inside the case of the server!
Unless you want to mod the whole setup with remote Vsense, you'll probably be better off set at 12.40-12.50V out on that thing for pretty much anything you'll run into in the real world.
If the delivered voltage is that important to your application, you should probably consider replacing the trimmer with a front-panel pot so you can set delivered voltage dead-nuts on the fly.
Anything designed to be powered by a wall-wart is typically going to be driven 0.5V-1.5V hotter than rated spec, even for regulated SMPS. As long as you're within that range, you're not going to hurt anything... there's a reason 16V is the most common voltage for brute-force filtering caps in this application.
I recommend a heavy patch cord (16-18gauge) with 5.5 x 2.1mm coax DC / Barrel connector on the end; this will plug into these:
https://www.amazon.ca/gp/product/B0722J415P/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1I've been using this arrangement on my HP DPS-1200 server Power Supply (and my little homebrew CC/CV PSU) for almost a year; it is just TOO convenient!
mnem
I have the POWAAAAHHH!!!