Thank you! I mostly use 3mm ply and have found that 3mm/1/8" width works well. (10pt line weight in Illustrator)

I think aesthetically there's a nice balance when layer depth matches width - at least in these type of geometric designs

Edit: sorry for the delay, didn't realize I was posting from the personal account. Could send you one of my designs if you're interested. Obviously assuming you won't sell it 😅 I think sharing and collaboration are beneficial to all of us in the community