I’ve done a quick version, deliberately the wrong size, for you to look at to get an understanding of how it should look.
Note:
- the thickness in the ‘Hole’ (not just a single face but two faces with space between)
- the lack of blue faces (blue faces are the back or inside and should not be visible on a solid)
- the way the small holes are on the flat faces between the hidden geometry (turn on hidden geometry in the view menu and see how the curve is made up of flat segments)
Edited Untitled Box3.skp (92.4 KB)
PS: There is also a built in error, I used 25 segments for the circle so it isn’t properly symmetrical. You should use the default 24 (or another even number) and pull it out on axis, then rotate it by half a segment to get the flat face aligned for the small holes.