My first frontpanels where made of polyprophylene, wich is o.k.ish, but in 5U veery woobly.
To finally get my ass up again and build all the stuff I have, I decided to rebuild my Cabinet.
I added real metal-rails and decided to do all my frontpanels anew with Alu-Dibond.
While planing this I had another idea. I found the arrangement of the knobs and jacks mostly to spacey on the 5U ... but 3U is in my eyes too small.
So I decided to crop all standard formats and build some 4Uish stuff, but stay at -+15Volts.
Best decision I made .. regarding formats.