Interesting idea Bob, but I reckon it'd feel precarious without the rider being able to lean towards the inside of a corner. I've ridden an adult trike configured like a kid's, with two rear wheels. I felt like it would tip over outwards easily. I'm also a bit dubious that the front fork of a standard bike could handle that sort of leverage through the axle line. That aside, nice work on the model and rendering. BTW, there's a motor scooter called Piaggio MP3 (Piaggio's an Italian conglomerate that builds Vespa scooters and high-end business turboprop planes) and a Gilera stablemate, both with two front wheels. The front end's suspension geometry leans the wheels inwards as standard single front wheels do, so the rider leans in as on a standard bike. They have a button that locks the front end upright when the machine's stationary, at lights and intersections, so the rider doesn't have to dab their feet. MP3s get great press for grip and handling and especially braking, because they double the front tyres' contact area over a standard bike, but their front ends are built sturdy.