I used 10mm. I like it because it's a good thickness for making a part look tanky without too much work, and the 10 plays well if I want to do some quick mental math. 8mm likely isn't that much different, plenty of people have made full builds with ~6mm.
@@JustMisterFox Yeah, I tried making a video on it once but I wasn't happy with how it turned out... and then I lost the project files anyways xD. Dang Windows. If you need help and aren't already in the 405th feel free to join the Discord I added to the description. I just created it the other day and plan to announce it in a video soon.