A trail 70 Passport is a decent bike for around the neighborhood but you need to decide what you really want. Is it a motorcycle, capable of speeds up to 60 MPH to drive on the Interstate or a motorized bicycle with speeds of 30-35 MPH to ride around the block?
From what I gather looking at the picture of what you want your bike to look like, you would rather build your own motorcycle with a bobber seat and old patina looks. You can do that too but you have to be willing to learn how to overhaul the bike yourself or pay someone to do it for you. If you want a good safe bicycle with an engine that can do 50-60 MPH I would suggest buying a moped bike (with pedals) and swapping that engine out for a larger one because of the heavy duty frame and wheels. You could do the same on a bicycle frame but be prepared for what happens if you hit a pot hole with a bicycle wheel.