I never had an Aermacchi but I did build a cool little Harley Hummer a number of years back. Late 40s vintage if I remember correctly...which I seldom do these days! It was part Harley Hummer and part Harley Scat. I called it a "Scummer." I actually sold it to a guy in Spokane. Took the sidecar body off the frame, bolted on a piece of plywood with eyehooks and strapped on the Scummer. Got on I-90 and headed west at a steady 50-55 mph. In 200 miles I only passed one vehicle and that was because I got past him before he hit the exit ramp to which he was headed. Got a lot of smiles from people on that trip.