Andy, the monument is at Via del Solstizio, 35, 31040 Nervesa della Battaglia, TV. You can find a marker on Google maps. Mr Giusti is going even further in honouring Lt DG McLean; he is commissioning the construction of a replica Sopwith Camel at the Jonathan Foundation. It is hoped that it will be completed in time for the centenary of his death in 1918.
Photos of the monument are available at https://www.google.it/maps/place/Monumento+a+Gordon+Donald+Mclean/@45.8495428,12.1628878,17z/data=!4m5!3m4!1s0x0:0xe59bb70b3c00a3e2!8m2!3d45.8501183!4d12.1634357?hl=en