Most modular systems need some kind of rack and enclosure for the modules.
First, at the top of this list is David Tatlebaum’s Nice Racks site. He makes excellent wooden racks. He has a variety of standard configurations and will also do custom work. I’ve moved most of my rack gear into these racks. Mahogany with a Tung Oil finish. Beautiful stuff.
Clicks & Clocks Great source for rack hardware, power supplies and connectors. Stefan is very fast to respond.
4ms Pedals Fabulous euro rack system, “Rows”. Power supplies and other accessories. Also euro modules and sundries.
Goike Very nice looking cabinets for euro rack systems