Hi Groc,
After reading your reply I am less worried and I think you are going the right way. As long as you know (or think you know) what you are doing regarding those sexy and fancy looking modules then that's all right.
Making a mistake is totally okay within Eurorack, has there been anybody out there that never made a mistake? :-) It's so common, that's totally fine and from those mistakes we can learn and improve ourselves regarding Eurorack or modular in common.
Did you bought already the casing? If not yet, then please consider a bigger one, for example the 7U of Intellijel, as already mentioned.
As Ronin mentioned there's always an interesting way to do things. It's like that old phrase saying: "There are many roads leading to Rome". The same is applicable for Eurorack. There are many different ways to get things done within Eurorack. With the exception of a few small matters, you actually can just do anything with Eurorack. You can patch whatever you like, you can experiment the way you want and during that process you learn a lot. So enjoy your first few modules and welcome to Eurorack :-)
Have fun, good luck and don't hesitate to check/ask here, kind regards, Garfield.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads