Very nice indeed! Thanks for sharing.
For mine, i'm going to stick with 3PDT toggle switch as the box is just for desk use. Also i'm going to have DC jack so i can use batteries with an adapter. A short can drain your battery in ~10 seconds, so i'd want to to be able to swap in a new one quickly. This could also be handy if i decide i can afford a auto-fused lab supply at some point. Stereo jack to switch power off when there's no cable in input jack could be nice too. Other things i've been thinking about are extra switchable power filtering, input pulldown and polarity protection. Those could be nice additions for development purposes. I'd also mount the terminals to the side of the box for minimum needed wire lenght.
Let's just see when my screw terminal one fails. The screw heads are beginning to give up...
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