Magnetic Work Tray

Looking for a smallish work tray when working on the printers , but since I tend to drop things on a gray carpet wanted a magnetic one( I use a Mag screwdriver now !).So designed this and added Bambu Magnetic pads (100x50 and 50x50 1.5mm depth) to keep things removed in place. 100x50 dimensions when printed have a 1 mm(ish) gap in 50mm direction but that does not worry me. The 50x50mm are spot on if slightly tight so use a smooth end to get it flat