Composite body part for a road vehicle, relative road vehicle and relative production method

A body part for a road vehicle (1) comprising:

• an outer portion (10) configured to be disposed outwardly of a road vehicle (1) and defining a first side (11) of the body part;
• an inner portion (12) configured to be disposed, with respect to the outer portion (10), towards a passenger compartment (3) of the road vehicle (1), and defining a second side (13) of the body part;
• wherein the outer portion (10) comprises one or more first composite material layers (14);
• and
• wherein the inner portion (12) comprises at least one or more second composite material layers (15);
• the body part further comprising an intermediate portion (16) arranged between the inner portion (12) and the outer portion (10);
• wherein the intermediate portion (16) further comprises a layer (17) of sound-absorbing material (M);
• and
• wherein the inner portion, the intermediate portion (16) and the outer portion (10) are integrally coupled together forming a single multilayer body (18);
• wherein the outer portion (10) comprises an odd number of first composite material layers (14);
• wherein the outer portion (10) comprises at least two, first composite material layers (14) having at least a first grammage and at least one, first composite material layers (14) having a second grammage, which are arranged alternately such that the first composite material layer (14) having the second grammage is between the first composite material layers (14) having the first grammage.