Sketchup - COPY ALONG CURVE

Create Rectangle 

Fillet the curves to make a curved profile using Fillet 2 edges can give fillet radius.

Offset the profile to create the top at two different levels.

Extrude to two different height.

Assign Material to the desk.

Select the desk Make a component.

Create the profile that need to be copied along the curve, Make it a group.

Select the curved profile copy it and paste in place using Edit command.

Right click and select Weld edges.

Under - Extension – Copy along curve

Select the profile to be copied along the curve.

Enter the spacing between the profile

Once done can view the profile created.