I don't know much at all about motors yet. You replaced the bushing with a wrist pin bearing? What is a wrist pin?
How many miles can you expect out of a morini? How rough can you be with a morini? Can you treat it like it were a motocross bike?
Are you going for a 4-stroke rack mount Easy? Wioth a NuVinci Hub? BTW I use those Armadillos and they are a great tyre. They're a rubber compound tread on kevlar walls. Great on corners. That frame looks like it will be a comfortable and fast ride.