Top tip is don't use hole punched sheet at speed it effectively becomes an air brake and will fight against it's mounting(s) till it breaks it, google stainless 'pulled sheer mesh' it's the stuff that plasters use to fill holes.
https://encrypted-tbn2.gstatic.com/i...68CteyMPJe0xoD
http://www.fhbrundle.co.uk/files/ima...ed%20metal.jpg