I needed a multi stl multi color Maple Leaf for another project. Spent HOURS cleaning it up nicely figured others might find a use for it.

Import all 4 files and ALIGN ORIGINS and then group them so you don't mis align them. Scale as desired once grouped

If you want to edit them more complexly get the 4 files in the ZIP file. those have registrations marks. once all 4 are in cad align all bottom right then raise the 3 detail files up 1.4mm then delete the registration marks from each when you are done messing with it and ready to export. keep two copies in case of misalignment.