The all-metal fuselage of the P.11 was matched to a twin-spar shoulder-mounted wing (which was also all-metal) via bearers set upon the upper portion of the first and second fuselage frames. The wing and the tail employed similar construction techniques, making use of Daude-type rivets, a corrugated duralumin sheet exterior and solid duralumin struts and plates for strengthening. The undercarriage comprised V-shape streamlined struts, furnished with Avia-type oleo pneumatic shock absorbers (including the tail skid) and were braced with steel wire.