Okay, so I want some comments about my approach.
I am running a side business, which does marketing related things.
I feel like setting up complete systems for these small projects is too heavy.
That is the reason why I decided to try this kind of a structure:
20-29 My company
21 Admin
22 Projects
22.01 Project
22.02 Project
22.03 Project
23 Sales & Marketing
24 Guides & Inspiration
I feel like in my case this is the simplest, stress-free way to go. If I go over 99, I will probably just use 3 digits.
If some of my projects need a couple of subfolders, I think I will just add them. I am not convinced that those will break my system or my brain (might find out the hard way).
Also another idea would be to store the contract for that project always with the name AC.ID.00 so it will be easy to find.
I think that the two digit and two level restrictions are genious and want to follow them. This is a rare case in which I would be willing to break the rules.
Ideas, problems, comments?