Position of the fixing holes would be the big one, measured from the edge of the plate to the centre of the hole and distance from hole to hole (centres again) which should all then line up with the size of the plate you have, if you can scan the plate and post the image with dimensions I can use that as a template, a photo will work but difficult to get square. Also the width of bezel outside of the plate and how deep you want it to be, not a critical dimension but aesthetics, is this for outside or inside, I've only got PLA+ at the moment so if it's for outside I'll need to get some PETG, also colour preference?What else do you need Dano? I just need something similar in the picture to hold the aluminium plate
Plate is 300x220mm and 1.5mm thick.