As a quick and dirty so I could drive the car I have some aluminium channel (lathered in white polyurethane sealent for easy waterproofing) fixed in place with some stainless mesh... I also have 1.5mm aluminium on its way with 10mm holes every 13mm and indeed some 12mm foam just arrived... 2m x 1m which is big enough for other places also ... they use it in nightclub speakers to stop pints getting poured down speakers
i will river the final affords up to avoid any chance of screws in tyres
ill post pics of the finished proper shields also once I’ve had them on the sheet metal bender and the car up on the ramp at work