Step 1 :

Construction of the first half-frame, using the Pad tool "adding material by extrusion of a closed plane contour".
 

Step 2 :

Construction of the bucket, using the Pocket tool "removal of material by extrusion of a closed plane contour".
 

Step 3 :

Construction of the front wheels axle passage and the pad, using the Groove tool "soustraction of material by revolution of a closed plane contour".
 

Step 4 :

Construction of the rear wheel axle passage, using the "translation copy" of the first wheel axle passage.
 

Step 5 :

Construction of roundings or filleting of the frame, using the Fillet tool.
  
 

Step 6 :

Construction of the second half-frame, using "copy by total symmetry" (of all that is already built) with respect to the plane of longitudinal symmetry.