Checking the Eurorack modules we need to use will all fit into the case. In the Eurorack format for synthesizer modules, the width of a module is defined as the number of hp (horizontal pitch) units. The rails which hold the modules are 84hp in width, so we use modulargrid.net to size everything up digitally before fitting the modules - the website lets you make your own digital racks to see what will fit by using accurate module sizes which fit to a grid... hence the name modular grid :)
We already have each of these modules in real life, and now we know they'll all fit into the case, which is good news.