EFN great review and pictures. I love and so do you it seems the MiniBox-E+. It is an outstanding amp that IMO does not get the credit it deserves, mostly because it is so inexpensive. But those who look the other way do not know what they are missing! We do.
Now, allow me to recommend you get a pair of AD797 op-amps. It provides a bit darker sound kind of tube like in their lushness, it would be a relatively cheap purchase and it may add to your listening experience.
A note is needed to explain probably the main reason that pushbuttons are used in the latest reincarnation of the MiniBox-E+. Simple, a few owners reported breaks of the toggle switch.
Anyways, continue enjoying the MiniBox-E+.