It's a left brake, right shift like the Brit bikes of the day. The air cleaner kind of sticks out a long way and with the forward controls, you almost have to stretch your leg out and catch the shift lever with the edge of your boot. It's got a long throw to shift so that just makes it worse.
I keep telling him to change it to a right side hand shifter and keep the left hand clutch. You'd have to take your hand off the throttle to shift, but it would be easier than what he's got now and would really look neat. I've seen a few Trumpet bobbers done that way. Some with a combo right hand clutch shift lever like this.