One more for the pile-on.

Creating a small-rack requires a lot of knowledge of Eurorack; more so than creating one that's a total of 208HP for example. Cramming everything that you need into such a small space means knowing exactly what the capabilities of your modules are and having confidence in your set-up to do everything you specifically want.

It's the difference between building a grandfather clock a pocket-watch. The finer details matter a LOT more.

Build a "complete" system, get familiar with Eurorack, then if you want to build a small rack it'll be less of an issue. Building a small rack from the get-go without intimate knowledge of Eurorack is going to mean a lot of wasted money and time.