Any opinions on this small starter rack?

Looks like a good small starter rack to me, except, you may want some sort of output for the system for listening reasons. Unless you have an external mixer like a Bastl Dude.

Looks good. But the smaller you build a Eurorack system, the less advantage it has over a synth-voice or semi-modular synth. Compared to a semi-modular, it's a lot more expensive for the same or less potent feature-set.