The frame for the second prototype is welded! We're testing the possibility of a passenger seat behind the driver's seat by making the rear wheel dropouts and the bottom bracket adjustable. By pushing the pedals forward and the rear wheel back, and using a 24" rear wheel, this should add 16-24" more room behind the driver's seat, enough for a teenager or small adult. We've also beefed up the rear suspension on this one to accommodate for the added weight. Can't wait to road test!