Step 1

The cube have 5cm bevels and we need 2mm bevels. Before dimensioning the cube, we need to first scale the whole cube by 0.2/5=4%.

Select all and scale x=4.00, y=4.00 and z=4.00.

Step 2

To ease the dimensioning of the cube, it is a good idea to first position the cube such that the lower left and yon corner is positioned at 0,0,0.

This can be achieved by setting the grid at 2mm and moving the cube with the cursor.

Step 3

From the front view, select the splines that defines the bevels for the right side of the cube then shift click a CP on the right bound face and enter 150cm in the X value of the "Selected CP" attribute panel.

Step 4

Repeat step 3 for the top and front faces.

From the left view, select the splines that defines the top face and enter 2.5cm for the Y value.

Select the splines that defines the front face and enter 75cm for the Z value.

Step 5

We now have a desk top with the proper bevels.

We just need to repeat these steps for the sides, front and back sides, for the legs and drawers and whatever nurnies needed to make it look real.