DIY - Pvc overflow non drilled

[Beano1169]

Hey all Im about to embark on creating a nano reef, 20 gallons. I dont really wanna drill my glass and have all that crazy plumbing going do I am thinking about creating a DIY PVC overflow from vids I have seen on youtube and all over the internet. I am curious about this in its affect on my glass, unfortunately my tank is only 6mm or 1/4" thick, will this PVC system be causing to much ware and tear on my rimless tank? please let me know so I can start building asap.