Trying to make a very small synth for everything I need
when I click on the link I get a different rack!!!
noob mistakes abound
these small cases are very expensive for each HP - get something 6u/104hp - a mantis for example (really good value) and space to grow into - without this you will just buy another case within a couple of months - or at least want to!!
and then go slowly - minimum viable synth - a sound source, a sound modifier, a modulation source (missing) and something to play it with and something to enable you to listen to it - add a disting mk4 - just so you can learn what different modules can do - if you constantly use the same algo, then buy that module and use disting for something else
and buy a quad cascading vca (veils or intellijel, for example) you will not regret it ever
after that only buy a module once you have learnt each module well and the rack as a whole well
BUT my advice is if you think that this is what you want from modular - get a mom32 or crave or something similar instead