Thanks for the reply Lugia!
The case is handmade, I wasn't completely sure about getting this risk but it's half price in comparison to the arturia one and the comments were all good so I trusted him.

https://www.ebay.it/itm/Eurorack-case-6-u-nero-doepfer-make-noise-intellijel-roland-mfb/323653315231?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2763.l2648

Definitely I will go slowly, after playing with those 3/4 modules for weeks things will clear up probably... good advice to "think big" and remove module after module. I will try!