Twiteryeanot 🏴So, in order to get around the problem of not having standard sized tracks on the top. I'm going to use a sheet of 3mm ply I've got lying around.
As I don't want to drill holes for fixing it to the top, I'm goingto drill small holes to sink 2mm x 5mm neodymium magnets (which i also have lying around), these should stop the sheet from moving or sliding off.