To my mind, a traveler on an arch makes sense ... keeps a lot of moving parts (under load) away from hands and feet...and provides a nice place to attach a cockpit light and/or speakers and even a RAM mic....and with an attached cradle, the arch doubles the function of the topping lift. The only down side I see is that the arch will get in the way of a bimi unless you take care to design that into your plans from the start. You will likely need a custom bimi system.