Here is another 3D How-to tutorial that might be of a help to improve your skill in 3D CAD Design using AutoDesk 123D Design.
For the sake of simplicity and practicality we wont be showing the icons allowing you to perform in each step, assuming you have been following the series of design with 123D design published earlier on here.
Modeling with Autodesk 123 Design
Draw a bow with the following dimension: 30 x 20 x 9
FILLET the corners with R6.5 such as to have the following
FILLET the bottom edge with R6
Create a series of cylinder with the following dimensions: Radius 2 and height 25
Place them like shown below, make sure they overlap with the main object.
Subtract those geometries from the main object
SHELL the top surface. SHELL distance o.5
Create 5 boxes with 2 x 9 x 10, And place them on a flat gap at the bottom on the soap case.
FILLET with R1 such as to have the following
Subtract those geometries from the soap case
Now let’s alter its contour where the cover will come and sit, to make it able to receive it.
Delete the inner shape, and Offset the outer shape with a distance of 0.25 inwards.
Extrude the created shape 1mm downwards.
The Geometry will automatically be subtracted from the soap case. Delete the 2D sketches and we are done!